sdl-ios-xcode: src/thread/win32/win_ce

annotate src/thread/win32/win_ce_semaphore.c @ 2842:97ba0be8b565

Date: Sat, 06 Dec 2008 15:27:00 +0100 From: Couriersud Subject: SDL: Relative mouse movements The patch below will reenable processing of relative mouse movements. The DirectFB drivers generates those in "grabbed" mode. These ensure, that even in fullscreen mode relative movements are reported. SDLMAME depends on this for games with trackballs. Looking at the code I ask myself whether relative movements should be handled in the drivers (x11, directfb). Both x11 and directfb are able to report relative movements. This would leave it to the driver to use the most appropriate method for relative movements when at the border of a fullscreen window or being "grabbed".

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 06 Dec 2008 17:50:50 +0000
parents	c121d94672cb
children

rev	line source
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1 /* win_ce_semaphore.c
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	2
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	3 Copyright (c) 1998, Johnson M. Hart
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	4 (with corrections 2001 by Rainer Loritz)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	5 Permission is granted for any and all use providing that this
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	6 copyright is properly acknowledged.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	7 There are no assurances of suitability for any use whatsoever.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	8
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	9 WINDOWS CE: There is a collection of Windows CE functions to simulate
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	10 semaphores using only a mutex and an event. As Windows CE events cannot
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	11 be named, these simulated semaphores cannot be named either.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	12
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	13 Implementation notes:
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	14 1. All required internal data structures are allocated on the process's heap.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	15 2. Where appropriate, a new error code is returned (see the header
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	16 file), or, if the error is a Win32 error, that code is unchanged.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	17 3. Notice the new handle type "SYNCHHANDLE" that has handles, counters,
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	18 and other information. This structure will grow as new objects are added
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	19 to this set; some members are specific to only one or two of the objects.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	20 4. Mutexes are used for critical sections. These could be replaced with
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	21 CRITICAL_SECTION objects but then this would give up the time out
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	22 capability.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	23 5. The implementation shows several interesting aspects of synchronization, some
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	24 of which are specific to Win32 and some of which are general. These are pointed
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	25 out in the comments as appropriate.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	26 6. The wait function emulates WaitForSingleObject only. An emulation of
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	27 WaitForMultipleObjects is much harder to implement outside the kernel,
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	28 and it is not clear how to handle a mixture of WCE semaphores and normal
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	29 events and mutexes. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	30
1433 bb6839704ed6 SDL_windows.h is no longer necessary Sam Lantinga <slouken@libsdl.org> parents: 1330 diff changeset	31 #define WIN32_LEAN_AND_MEAN
bb6839704ed6 SDL_windows.h is no longer necessary Sam Lantinga <slouken@libsdl.org> parents: 1330 diff changeset	32 #include <windows.h>
bb6839704ed6 SDL_windows.h is no longer necessary Sam Lantinga <slouken@libsdl.org> parents: 1330 diff changeset	33
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	34 #include "win_ce_semaphore.h"
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	35
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	36 static SYNCHHANDLE CleanUp(SYNCHHANDLE hSynch, DWORD Flags);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	37
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	38 SYNCHHANDLE
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	39 CreateSemaphoreCE(LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, /* pointer to security attributes */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	40 LONG lInitialCount, /* initial count */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	41 LONG lMaximumCount, /* maximum count */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	42 LPCTSTR lpName)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	43 /* Semaphore for use with Windows CE that does not support them directly.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	44 Requires a counter, a mutex to protect the counter, and an
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	45 autoreset event.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	46
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	47 Here are the rules that must always hold between the autoreset event
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	48 and the mutex (any violation of these rules by the CE semaphore functions
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	49 will, in all likelihood, result in a defect):
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	50 1. No thread can set, pulse, or reset the event,
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	51 nor can it access any part of the SYNCHHANDLE structure,
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	52 without first gaining ownership of the mutex.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	53 BUT, a thread can wait on the event without owning the mutex
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	54 (this is clearly necessary or else the event could never be set).
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	55 2. The event is in a signaled state if and only if the current semaphore
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	56 count ("CurCount") is greater than zero.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	57 3. The semaphore count is always >= 0 and <= the maximum count */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	58 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	59 SYNCHHANDLE hSynch = NULL, result = NULL;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	60
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	61 __try {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	62 if (lInitialCount > lMaximumCount \|\| lMaximumCount < 0
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	63 \|\| lInitialCount < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	64 /* Bad parameters */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	65 SetLastError(SYNCH_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	66 __leave;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	67 }
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	68
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	69 hSynch =
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	70 HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, SYNCH_HANDLE_SIZE);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	71 if (hSynch == NULL)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	72 __leave;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	73
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	74 hSynch->MaxCount = lMaximumCount;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	75 hSynch->CurCount = lInitialCount;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	76 hSynch->lpName = lpName;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	77
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	78 hSynch->hMutex = CreateMutex(lpSemaphoreAttributes, FALSE, NULL);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	79
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	80 WaitForSingleObject(hSynch->hMutex, INFINITE);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	81 /* Create the event. It is initially signaled if and only if the
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	82 initial count is > 0 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	83 hSynch->hEvent = CreateEvent(lpSemaphoreAttributes, FALSE,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	84 lInitialCount > 0, NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	85 ReleaseMutex(hSynch->hMutex);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	86 hSynch->hSemph = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	87 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	88 __finally {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	89 /* Return with the handle, or, if there was any error, return
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	90 a null after closing any open handles and freeing any allocated memory. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	91 result =
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	92 CleanUp(hSynch, 6 /* An event and a mutex, but no semaphore. */ );
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	93 }
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	94
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	95 return result;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	96 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	97
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	98 BOOL
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	99 ReleaseSemaphoreCE(SYNCHHANDLE hSemCE, LONG cReleaseCount,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	100 LPLONG lpPreviousCount)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	101 /* Windows CE equivalent to ReleaseSemaphore. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	102 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	103 BOOL Result = TRUE;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	104
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	105 /* Gain access to the object to assure that the release count
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	106 would not cause the total count to exceed the maximum. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	107
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	108 __try {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	109 WaitForSingleObject(hSemCE->hMutex, INFINITE);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	110 /* reply only if asked to */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	111 if (lpPreviousCount != NULL)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	112 *lpPreviousCount = hSemCE->CurCount;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	113 if (hSemCE->CurCount + cReleaseCount > hSemCE->MaxCount
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	114 \|\| cReleaseCount <= 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	115 SetLastError(SYNCH_ERROR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	116 Result = FALSE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	117 __leave;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	118 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	119 hSemCE->CurCount += cReleaseCount;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	120
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	121 /* Set the autoreset event, releasing exactly one waiting thread, now or
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	122 in the future. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	123
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	124 SetEvent(hSemCE->hEvent);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	125 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	126 __finally {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	127 ReleaseMutex(hSemCE->hMutex);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	128 }
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	129
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	130 return Result;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	131 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	132
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	133 DWORD
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	134 WaitForSemaphoreCE(SYNCHHANDLE hSemCE, DWORD dwMilliseconds)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	135 /* Windows CE semaphore equivalent of WaitForSingleObject. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	136 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	137 DWORD WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	138
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	139 WaitResult = WaitForSingleObject(hSemCE->hMutex, dwMilliseconds);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	140 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	141 return WaitResult;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	142 while (hSemCE->CurCount <= 0) {
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	143
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	144 /* The count is 0, and the thread must wait on the event (which, by
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	145 the rules, is currently reset) for semaphore resources to become
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	146 available. First, of course, the mutex must be released so that another
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	147 thread will be capable of setting the event. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	148
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	149 ReleaseMutex(hSemCE->hMutex);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	150
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	151 /* Wait for the event to be signaled, indicating a semaphore state change.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	152 The event is autoreset and signaled with a SetEvent (not PulseEvent)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	153 so exactly one waiting thread (whether or not there is currently
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	154 a waiting thread) is released as a result of the SetEvent. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	155
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	156 WaitResult = WaitForSingleObject(hSemCE->hEvent, dwMilliseconds);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	157 if (WaitResult != WAIT_OBJECT_0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	158 return WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	159
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	160 /* This is where the properties of setting of an autoreset event is critical
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	161 to assure that, even if the semaphore state changes between the
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	162 preceding Wait and the next, and even if NO threads are waiting
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	163 on the event at the time of the SetEvent, at least one thread
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	164 will be released.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	165 Pulsing a manual reset event would appear to work, but it would have
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	166 a defect which could appear if the semaphore state changed between
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	167 the two waits. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	168
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	169 WaitResult = WaitForSingleObject(hSemCE->hMutex, dwMilliseconds);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	170 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	171 return WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	172
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	173 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	174 /* The count is not zero and this thread owns the mutex. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	175
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	176 hSemCE->CurCount--;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	177 /* The event is now unsignaled, BUT, the semaphore count may not be
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	178 zero, in which case the event should be signaled again
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	179 before releasing the mutex. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	180
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	181 if (hSemCE->CurCount > 0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	182 SetEvent(hSemCE->hEvent);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	183 ReleaseMutex(hSemCE->hMutex);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	184 return WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	185 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	186
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	187 BOOL
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	188 CloseSynchHandle(SYNCHHANDLE hSynch)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	189 /* Close a synchronization handle.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	190 Improvement: Test for a valid handle before dereferencing the handle. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	191 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	192 BOOL Result = TRUE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	193 if (hSynch->hEvent != NULL)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	194 Result = Result && CloseHandle(hSynch->hEvent);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	195 if (hSynch->hMutex != NULL)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	196 Result = Result && CloseHandle(hSynch->hMutex);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	197 if (hSynch->hSemph != NULL)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	198 Result = Result && CloseHandle(hSynch->hSemph);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	199 HeapFree(GetProcessHeap(), 0, hSynch);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	200 return (Result);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	201 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	202
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	203 static SYNCHHANDLE
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	204 CleanUp(SYNCHHANDLE hSynch, DWORD Flags)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	205 { /* Prepare to return from a create of a synchronization handle.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	206 If there was any failure, free any allocated resources.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	207 "Flags" indicates which Win32 objects are required in the
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	208 synchronization handle. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	209
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	210 BOOL ok = TRUE;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	211
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	212 if (hSynch == NULL)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	213 return NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	214 if ((Flags & 4) == 1 && (hSynch->hEvent == NULL))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	215 ok = FALSE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	216 if ((Flags & 2) == 1 && (hSynch->hMutex == NULL))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	217 ok = FALSE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	218 if ((Flags & 1) == 1 && (hSynch->hEvent == NULL))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	219 ok = FALSE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	220 if (!ok) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	221 CloseSynchHandle(hSynch);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	222 return NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	223 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	224 /* Everything worked */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	225 return hSynch;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	226 }
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	227
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1433 diff changeset	228 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/thread/win32/win_ce_semaphore.c @ 2842:97ba0be8b565