Mercurial > sdl-ios-xcode

annotate src/thread/win32/win_ce_semaphore.c @ 1650:ee4f2d77206f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Whoops, you can't use Project Builder anymore...
author Sam Lantinga <slouken@libsdl.org>
date Sat, 22 Apr 2006 19:50:23 +0000
parents bb6839704ed6
children 782fd950bd46 c121d94672cb
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
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
36 static SYNCHHANDLE CleanUp (SYNCHHANDLE hSynch, DWORD Flags);
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 SYNCHHANDLE CreateSemaphoreCE (
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
39
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
40 LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, /* pointer to security attributes */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
41 LONG lInitialCount, /* initial count */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
42 LONG lMaximumCount, /* maximum count */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
43 LPCTSTR lpName )
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
44
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
45 /* 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
46 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
47 autoreset event.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
48
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
49 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
50 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
51 will, in all likelihood, result in a defect):
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
52 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
53 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
54 without first gaining ownership of the mutex.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
55 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
56 (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
57 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
58 count ("CurCount") is greater than zero.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
59 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
60
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 SYNCHHANDLE hSynch = NULL, result = NULL;
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 __try
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 if (lInitialCount > lMaximumCount || lMaximumCount < 0 || lInitialCount < 0)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
67 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
68 /* Bad parameters */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
69 SetLastError (SYNCH_ERROR);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
70 __leave;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
71 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
72
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
73 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
74 if (hSynch == NULL) __leave;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
75
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
76 hSynch->MaxCount = lMaximumCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
77 hSynch->CurCount = lInitialCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
78 hSynch->lpName = lpName;
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 hSynch->hMutex = CreateMutex (lpSemaphoreAttributes, FALSE, NULL);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
81
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
82 WaitForSingleObject (hSynch->hMutex, INFINITE);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
83 /* 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
84 initial count is > 0 */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
85 hSynch->hEvent = CreateEvent (lpSemaphoreAttributes, FALSE,
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
86 lInitialCount > 0, NULL);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
87 ReleaseMutex (hSynch->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
88 hSynch->hSemph = NULL;
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 __finally
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
91 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
92 /* 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
93 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
94 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
95 }
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 return result;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
98 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
99
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
100 BOOL ReleaseSemaphoreCE (SYNCHHANDLE hSemCE, LONG cReleaseCount, LPLONG lpPreviousCount)
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 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
103 BOOL Result = TRUE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
104
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
105 /* 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
106 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
107
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
108 __try
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
109 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
110 WaitForSingleObject (hSemCE->hMutex, INFINITE);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
111 /* reply only if asked to */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
112 if (lpPreviousCount!=NULL)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
113 *lpPreviousCount = hSemCE->CurCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
114 if (hSemCE->CurCount + cReleaseCount > hSemCE->MaxCount || cReleaseCount <= 0)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
115 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
116 SetLastError (SYNCH_ERROR);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
117 Result = FALSE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
118 __leave;
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 hSemCE->CurCount += cReleaseCount;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
121
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
122 /* 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
123 in the future. */
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 SetEvent (hSemCE->hEvent);
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 __finally
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 ReleaseMutex (hSemCE->hMutex);
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
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
132 return Result;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
133 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
134
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
135 DWORD WaitForSemaphoreCE (SYNCHHANDLE hSemCE, DWORD dwMilliseconds)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
136 /* Windows CE semaphore equivalent of WaitForSingleObject. */
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 DWORD WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
139
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
140 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
141 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
142 while (hSemCE->CurCount <= 0)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
143 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
144
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
145 /* 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
146 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
147 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
148 thread will be capable of setting the event. */
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 ReleaseMutex (hSemCE->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
151
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
152 /* 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
153 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
154 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
155 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
156
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
157 WaitResult = WaitForSingleObject (hSemCE->hEvent, dwMilliseconds);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
158 if (WaitResult != WAIT_OBJECT_0) return WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
159
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
160 /* 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
161 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
162 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
163 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
164 will be released.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
165 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
166 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
167 the two waits. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
168
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
169 WaitResult = WaitForSingleObject (hSemCE->hMutex, dwMilliseconds);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
170 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
171
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 /* 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
174
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
175 hSemCE->CurCount--;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
176 /* 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
177 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
178 before releasing the mutex. */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
179
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
180 if (hSemCE->CurCount > 0) SetEvent (hSemCE->hEvent);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
181 ReleaseMutex (hSemCE->hMutex);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
182 return WaitResult;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
183 }
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 BOOL CloseSynchHandle (SYNCHHANDLE hSynch)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
186 /* Close a synchronization handle.
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
187 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
188 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
189 BOOL Result = TRUE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
190 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
191 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
192 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
193 HeapFree (GetProcessHeap (), 0, hSynch);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
194 return (Result);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
195 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
196
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
197 static SYNCHHANDLE CleanUp (SYNCHHANDLE hSynch, DWORD Flags)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
198 { /* 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
199 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
200 "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
201 synchronization handle. */
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 BOOL ok = TRUE;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
204
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
205 if (hSynch == NULL) return NULL;
1251
86d0d01290ea Updated Windows CE/PocketPC support...adds GAPI driver, landscape mode,
Ryan C. Gordon <icculus@icculus.org>
parents: 36
diff changeset
206 if ((Flags & 4) == 1 && (hSynch->hEvent == NULL)) ok = FALSE;
86d0d01290ea Updated Windows CE/PocketPC support...adds GAPI driver, landscape mode,
Ryan C. Gordon <icculus@icculus.org>
parents: 36
diff changeset
207 if ((Flags & 2) == 1 && (hSynch->hMutex == NULL)) ok = FALSE;
86d0d01290ea Updated Windows CE/PocketPC support...adds GAPI driver, landscape mode,
Ryan C. Gordon <icculus@icculus.org>
parents: 36
diff changeset
208 if ((Flags & 1) == 1 && (hSynch->hEvent == NULL)) ok = FALSE;
36
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
209 if (!ok)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
210 {
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
211 CloseSynchHandle (hSynch);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
212 return NULL;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
213 }
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
214 /* Everything worked */
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
215 return hSynch;
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
216 }