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

annotate src/thread/windows/win_ce_semaphore.c @ 5172:ededa1ccf91c

Switched the SDL 1.2 compatibility to use the window surface, so it's fast even when there's no hardware acceleration available. This means that the YUV overlay now uses software, but that's okay since fast YUV code should be using the textures now anyway.

author	Sam Lantinga <slouken@libsdl.org>
date	Thu, 03 Feb 2011 21:13:55 -0800
parents	327f181542f1
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
5092 327f181542f1 Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share. Sam Lantinga <slouken@libsdl.org> parents: 5062 diff changeset	31 #include "../../core/windows/SDL_windows.h"
1433 bb6839704ed6 SDL_windows.h is no longer necessary Sam Lantinga <slouken@libsdl.org> parents: 1330 diff changeset	32
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	33 #include "win_ce_semaphore.h"
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	34
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	35 static SYNCHHANDLE CleanUp(SYNCHHANDLE hSynch, DWORD Flags);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	36
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	37 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	38 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	39 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	40 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	41 LPCTSTR lpName)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	42 /* 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	43 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	44 autoreset event.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	45
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	46 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	47 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	48 will, in all likelihood, result in a defect):
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	49 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	50 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	51 without first gaining ownership of the mutex.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	52 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	53 (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	54 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	55 count ("CurCount") is greater than zero.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	56 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	57 {
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	58 SYNCHHANDLE hSynch = NULL, result = NULL;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	59
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	60 __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	61 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	62 \|\| 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	63 /* 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	64 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	65 __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	66 }
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	67
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	68 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	69 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	70 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	71 __leave;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	72
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	73 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	74 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	75 hSynch->lpName = lpName;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	76
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	77 hSynch->hMutex = CreateMutex(lpSemaphoreAttributes, FALSE, NULL);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	78
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	79 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	80 /* 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	81 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	82 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	83 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	84 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	85 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	86 }
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 __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	88 /* 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	89 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	90 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	91 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	92 }
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	93
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	94 return result;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	95 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	96
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	97 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	98 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	99 LPLONG lpPreviousCount)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	100 /* Windows CE equivalent to ReleaseSemaphore. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	101 {
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	102 BOOL Result = TRUE;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	103
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	104 /* 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	105 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	106
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	107 __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	108 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	109 /* 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	110 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	111 *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	112 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	113 \|\| 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	114 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	115 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	116 __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	117 }
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 hSemCE->CurCount += cReleaseCount;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	119
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	120 /* 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	121 in the future. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	122
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	123 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	124 }
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 __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	126 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	127 }
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	128
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	129 return Result;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	130 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	131
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	132 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	133 WaitForSemaphoreCE(SYNCHHANDLE hSemCE, DWORD dwMilliseconds)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	134 /* Windows CE semaphore equivalent of WaitForSingleObject. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	135 {
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	136 DWORD WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	137
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	138 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	139 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	140 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	141 while (hSemCE->CurCount <= 0) {
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	142
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	143 /* 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	144 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	145 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	146 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	147
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	148 ReleaseMutex(hSemCE->hMutex);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	149
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	150 /* 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	151 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	152 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	153 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	154
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	155 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	156 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	157 return WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	158
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	159 /* 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	160 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	161 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	162 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	163 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	164 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	165 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	166 the two waits. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	167
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	168 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	169 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	170 return WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	171
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	172 }
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 /* 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	174
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	175 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	176 /* 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	177 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	178 before releasing the mutex. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	179
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	180 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	181 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	182 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	183 return WaitResult;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	184 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	185
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	186 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	187 CloseSynchHandle(SYNCHHANDLE hSynch)
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	188 /* Close a synchronization handle.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	189 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	190 {
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	191 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	192 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	193 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	194 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	195 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	196 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	197 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	198 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	199 return (Result);
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	200 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	201
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	202 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	203 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	204 { /* 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	205 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	206 "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	207 synchronization handle. */
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	208
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	209 BOOL ok = TRUE;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	210
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	211 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	212 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	213 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	214 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	215 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	216 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	217 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	218 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	219 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	220 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	221 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	222 }
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 /* 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	224 return hSynch;
36 13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	225 }
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	226
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 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/thread/windows/win_ce_semaphore.c @ 5172:ededa1ccf91c