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

annotate src/thread/win32/win_ce_semaphore.c @ 1228:f4a3a4129d04

From Mike Frysinger and/or Gentoo: - libsdl-SDL_stretch-PIC.patch ignoring the general fact of how SDL_stretch relies on executing dynamic code, the inline asm should let gcc handle the a details for getting the actual address for _copy_row as it will do the right thing test case: http://dev.gentoo.org/~vapier/libsdl/sdl-stretch.tar.bz2

author	Ryan C. Gordon <icculus@icculus.org>
date	Thu, 05 Jan 2006 07:20:12 +0000
parents	13ee9f4834ea
children	86d0d01290ea

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
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	31 #include <windows.h>
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	32 #include "win_ce_semaphore.h"
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	33
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	34 static SYNCHHANDLE CleanUp (SYNCHHANDLE hSynch, DWORD Flags);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	35
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	36 SYNCHHANDLE CreateSemaphoreCE (
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	37
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	38 LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, /* pointer to security attributes */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	39 LONG lInitialCount, /* initial count */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	40 LONG lMaximumCount, /* maximum count */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	41 LPCTSTR lpName )
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	42
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
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	59 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	60 SYNCHHANDLE hSynch = NULL, result = NULL;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	61
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	62 __try
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	63 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	64 if (lInitialCount > lMaximumCount \|\| lMaximumCount < 0 \|\| lInitialCount < 0)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	65 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	66 /* Bad parameters */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	67 SetLastError (SYNCH_ERROR);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	68 __leave;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	69 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	70
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	71 hSynch = HeapAlloc (GetProcessHeap(), HEAP_ZERO_MEMORY, SYNCH_HANDLE_SIZE);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	72 if (hSynch == NULL) __leave;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	73
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	74 hSynch->MaxCount = lMaximumCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	75 hSynch->CurCount = lInitialCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	76 hSynch->lpName = lpName;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	77
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	78 hSynch->hMutex = CreateMutex (lpSemaphoreAttributes, FALSE, NULL);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	79
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	80 WaitForSingleObject (hSynch->hMutex, INFINITE);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	81 /* Create the event. It is initially signaled if and only if the
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	82 initial count is > 0 */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	83 hSynch->hEvent = CreateEvent (lpSemaphoreAttributes, FALSE,
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	84 lInitialCount > 0, NULL);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	85 ReleaseMutex (hSynch->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	86 hSynch->hSemph = NULL;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	87 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	88 __finally
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	89 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	90 /* Return with the handle, or, if there was any error, return
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	91 a null after closing any open handles and freeing any allocated memory. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	92 result=CleanUp(hSynch, 6 /* An event and a mutex, but no semaphore. */);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	93 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	94
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	95 return result;
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
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	98 BOOL ReleaseSemaphoreCE (SYNCHHANDLE hSemCE, LONG cReleaseCount, LPLONG lpPreviousCount)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	99 /* Windows CE equivalent to ReleaseSemaphore. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	100 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	101 BOOL Result = TRUE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	102
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	103 /* Gain access to the object to assure that the release count
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	104 would not cause the total count to exceed the maximum. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	105
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	106 __try
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	107 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	108 WaitForSingleObject (hSemCE->hMutex, INFINITE);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	109 /* reply only if asked to */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	110 if (lpPreviousCount!=NULL)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	111 *lpPreviousCount = hSemCE->CurCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	112 if (hSemCE->CurCount + cReleaseCount > hSemCE->MaxCount \|\| cReleaseCount <= 0)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	113 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	114 SetLastError (SYNCH_ERROR);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	115 Result = FALSE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	116 __leave;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	117 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	118 hSemCE->CurCount += cReleaseCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	119
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	120 /* Set the autoreset event, releasing exactly one waiting thread, now or
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	121 in the future. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	122
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	123 SetEvent (hSemCE->hEvent);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	124 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	125 __finally
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	126 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	127 ReleaseMutex (hSemCE->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	128 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	129
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	130 return Result;
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
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	133 DWORD WaitForSemaphoreCE (SYNCHHANDLE hSemCE, DWORD dwMilliseconds)
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 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	136 DWORD WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	137
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	138 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	139 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0) return WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	140 while (hSemCE->CurCount <= 0)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	141 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	142
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	143 /* The count is 0, and the thread must wait on the event (which, by
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	144 the rules, is currently reset) for semaphore resources to become
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	145 available. First, of course, the mutex must be released so that another
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	146 thread will be capable of setting the event. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	147
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	148 ReleaseMutex (hSemCE->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	149
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	150 /* Wait for the event to be signaled, indicating a semaphore state change.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	151 The event is autoreset and signaled with a SetEvent (not PulseEvent)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	152 so exactly one waiting thread (whether or not there is currently
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	153 a waiting thread) is released as a result of the SetEvent. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	154
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	155 WaitResult = WaitForSingleObject (hSemCE->hEvent, dwMilliseconds);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	156 if (WaitResult != WAIT_OBJECT_0) return WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	157
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	158 /* This is where the properties of setting of an autoreset event is critical
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	159 to assure that, even if the semaphore state changes between the
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	160 preceding Wait and the next, and even if NO threads are waiting
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	161 on the event at the time of the SetEvent, at least one thread
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	162 will be released.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	163 Pulsing a manual reset event would appear to work, but it would have
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	164 a defect which could appear if the semaphore state changed between
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	165 the two waits. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	166
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	167 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	168 if (WaitResult != WAIT_OBJECT_0 && WaitResult != WAIT_ABANDONED_0) return WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	169
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	170 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	171 /* The count is not zero and this thread owns the mutex. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	172
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	173 hSemCE->CurCount--;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	174 /* The event is now unsignaled, BUT, the semaphore count may not be
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	175 zero, in which case the event should be signaled again
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	176 before releasing the mutex. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	177
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	178 if (hSemCE->CurCount > 0) SetEvent (hSemCE->hEvent);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	179 ReleaseMutex (hSemCE->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	180 return WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	181 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	182
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	183 BOOL CloseSynchHandle (SYNCHHANDLE hSynch)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	184 /* Close a synchronization handle.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	185 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	186 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	187 BOOL Result = TRUE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	188 if (hSynch->hEvent != NULL) Result = Result && CloseHandle (hSynch->hEvent);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	189 if (hSynch->hMutex != NULL) Result = Result && CloseHandle (hSynch->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	190 if (hSynch->hSemph != NULL) Result = Result && CloseHandle (hSynch->hSemph);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	191 HeapFree (GetProcessHeap (), 0, hSynch);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	192 return (Result);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	193 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	194
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	195 static SYNCHHANDLE CleanUp (SYNCHHANDLE hSynch, DWORD Flags)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	196 { /* Prepare to return from a create of a synchronization handle.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	197 If there was any failure, free any allocated resources.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	198 "Flags" indicates which Win32 objects are required in the
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	199 synchronization handle. */
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 BOOL ok = TRUE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	202
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	203 if (hSynch == NULL) return NULL;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	204 if (Flags & 4 == 1 && hSynch->hEvent == NULL) ok = FALSE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	205 if (Flags & 2 == 1 && hSynch->hMutex == NULL) ok = FALSE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	206 if (Flags & 1 == 1 && hSynch->hEvent == NULL) ok = FALSE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	207 if (!ok)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	208 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	209 CloseSynchHandle (hSynch);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	210 return NULL;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	211 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	212 /* Everything worked */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	213 return hSynch;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz Sam Lantinga <slouken@lokigames.com> parents: diff changeset	214 }

Mercurial > sdl-ios-xcode

annotate src/thread/win32/win_ce_semaphore.c @ 1228:f4a3a4129d04