2 * mono-semaphore.c: mono-semaphore functions
5 * Gonzalo Paniagua Javier <gonzalo@novell.com>
7 * (C) 2010 Novell, Inc.
12 #include "utils/mono-semaphore.h"
13 #ifdef HAVE_SYS_TIME_H
20 #if (defined (HAVE_SEMAPHORE_H) || defined (USE_MACH_SEMA)) && !defined(HOST_WIN32)
21 /* sem_* or semaphore_* functions in use */
23 # define TIMESPEC mach_timespec_t
24 # define WAIT_BLOCK(a,b) semaphore_timedwait (*(a), *(b))
25 # elif defined(__native_client__) && defined(USE_NEWLIB)
26 # define TIMESPEC struct timespec
27 # define WAIT_BLOCK(a, b) sem_trywait(a)
28 # elif defined(__OpenBSD__)
29 # define TIMESPEC struct timespec
30 # define WAIT_BLOCK(a) sem_trywait(a)
32 # define TIMESPEC struct timespec
33 # define WAIT_BLOCK(a,b) sem_timedwait (a, b)
37 #define NSEC_PER_SEC 1000000000
41 mono_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, gboolean alertable)
46 #if defined(__OpenBSD__)
52 return sem_trywait (sem);
54 if (timeout_ms == (guint32) 0xFFFFFFFF)
55 return mono_sem_wait (sem, alertable);
58 memset (&t, 0, sizeof (t));
60 gettimeofday (&t, NULL);
62 ts.tv_sec = timeout_ms / 1000 + t.tv_sec;
63 ts.tv_nsec = (timeout_ms % 1000) * 1000000 + t.tv_usec * 1000;
64 while (ts.tv_nsec > NSEC_PER_SEC) {
65 ts.tv_nsec -= NSEC_PER_SEC;
68 #if defined(__OpenBSD__)
71 if ((res = WAIT_BLOCK (sem)) == 0)
77 usleep (ts.tv_nsec / 1000);
82 while ((res = WAIT_BLOCK (sem, &ts)) == -1 && errno == EINTR) {
83 struct timeval current;
87 memset (¤t, 0, sizeof (current));
89 gettimeofday (¤t, NULL);
92 ts.tv_sec -= (current.tv_sec - t.tv_sec);
93 ts.tv_nsec -= (current.tv_usec - t.tv_usec) * 1000;
99 ts.tv_nsec += NSEC_PER_SEC;
108 /* OSX might return > 0 for error */
115 mono_sem_wait (MonoSemType *sem, gboolean alertable)
118 #ifndef USE_MACH_SEMA
119 while ((res = sem_wait (sem)) == -1 && errno == EINTR)
121 while ((res = semaphore_wait (*sem)) == KERN_ABORTED)
127 /* OSX might return > 0 for error */
134 mono_sem_post (MonoSemType *sem)
137 #ifndef USE_MACH_SEMA
138 while ((res = sem_post (sem)) == -1 && errno == EINTR);
140 res = semaphore_signal (*sem);
141 /* OSX might return > 0 for error */
142 if (res != KERN_SUCCESS)
149 /* Windows or io-layer functions in use */
151 mono_sem_wait (MonoSemType *sem, gboolean alertable)
153 return mono_sem_timedwait (sem, INFINITE, alertable);
157 mono_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, gboolean alertable)
161 while ((res = WaitForSingleObjectEx (*sem, timeout_ms, alertable)) == WAIT_IO_COMPLETION) {
170 // WAIT_TIMEOUT and WAIT_FAILED
177 mono_sem_post (MonoSemType *sem)
179 if (!ReleaseSemaphore (*sem, 1, NULL))