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Implement a generic cgsem_mswait similar to sem_timedwait

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This commit is contained in:
Con Kolivas 2013-10-14 11:22:57 +11:00
parent 9ca22ed493
commit c75ce853a9
2 changed files with 51 additions and 0 deletions
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50
util.c
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@ -881,6 +881,14 @@ void ms_to_timespec(struct timespec *spec, int64_t ms)
spec->tv_nsec = tvdiv.rem * 1000000; spec->tv_nsec = tvdiv.rem * 1000000;
} }
void ms_to_timeval(struct timeval *val, int64_t ms)
{
lldiv_t tvdiv = lldiv(ms, 1000);
val->tv_sec = tvdiv.quot;
val->tv_usec = tvdiv.rem * 1000;
}
void timeraddspec(struct timespec *a, const struct timespec *b) void timeraddspec(struct timespec *a, const struct timespec *b)
{ {
a->tv_sec += b->tv_sec; a->tv_sec += b->tv_sec;
@ -2407,6 +2415,31 @@ void _cgsem_destroy(cgsem_t *cgsem)
close(cgsem->pipefd[1]); close(cgsem->pipefd[1]);
close(cgsem->pipefd[0]); close(cgsem->pipefd[0]);
} }
/* This is similar to sem_timedwait but takes a millisecond value */
int _cgsem_mswait(cgsem_t *cgsem, int ms, const char *file, const char *func, const int line)
{
struct timeval timeout;
int ret, fd;
fd_set rd;
char buf;
fd = cgsem->pipefd[0];
FD_ZERO(&rd);
FD_SET(fd, &rd);
ms_to_timeval(&timeout, ms);
ret = select(fd + 1, &rd, NULL, NULL, &timeout);
if (ret > 0) {
ret = read(fd, &buf, 1);
return 0;
}
if (likely(!ret))
return ETIMEDOUT;
quitfrom(1, file, func, line, "Failed to sem_timedwait errno=%d cgsem=0x%p", errno, cgsem);
/* We don't reach here */
return 0;
}
#else #else
void _cgsem_init(cgsem_t *cgsem, const char *file, const char *func, const int line) void _cgsem_init(cgsem_t *cgsem, const char *file, const char *func, const int line)
{ {
@ -2427,6 +2460,23 @@ void _cgsem_wait(cgsem_t *cgsem, const char *file, const char *func, const int l
quitfrom(1, file, func, line, "Failed to sem_wait errno=%d cgsem=0x%p", errno, cgsem); quitfrom(1, file, func, line, "Failed to sem_wait errno=%d cgsem=0x%p", errno, cgsem);
} }
int _cgsem_mswait(cgsem_t *cgsem, int ms, const char *file, const char *func, const int line)
{
struct timespec abs_timeout, ts_now;
struct timeval tv_now;
int ret;
cgtime(&tv_now);
timeval_to_spec(&ts_now, &tv_now);
ms_to_timespec(&abs_timeout, ms);
timeraddspec(&abs_timeout, &ts_now);
ret = sem_timedwait(cgsem, &abs_timeout);
if (unlikely(ret && ret != ETIMEDOUT))
quitfrom(1, file, func, line, "Failed to sem_timedwait errno=%d cgsem=0x%p", errno, cgsem);
return ret;
}
void _cgsem_destroy(cgsem_t *cgsem) void _cgsem_destroy(cgsem_t *cgsem)
{ {
sem_destroy(cgsem); sem_destroy(cgsem);

1
util.h
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@ -129,6 +129,7 @@ void _cgsem_destroy(cgsem_t *cgsem);
#define cgsem_init(_sem) _cgsem_init(_sem, __FILE__, __func__, __LINE__) #define cgsem_init(_sem) _cgsem_init(_sem, __FILE__, __func__, __LINE__)
#define cgsem_post(_sem) _cgsem_post(_sem, __FILE__, __func__, __LINE__) #define cgsem_post(_sem) _cgsem_post(_sem, __FILE__, __func__, __LINE__)
#define cgsem_wait(_sem) _cgsem_wait(_sem, __FILE__, __func__, __LINE__) #define cgsem_wait(_sem) _cgsem_wait(_sem, __FILE__, __func__, __LINE__)
#define cgmsem_mswait(_sem, _timeout) _cgsem_mswait(_sem, _timeout, __FILE__, __func__, __LINE__)
#define cgsem_destroy(_sem) _cgsem_destroy(_sem) #define cgsem_destroy(_sem) _cgsem_destroy(_sem)
/* Align a size_t to 4 byte boundaries for fussy arches */ /* Align a size_t to 4 byte boundaries for fussy arches */