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Simplify code by using flag O_EXLOCK.

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PR: kern/175674
This commit is contained in:
David Xu 2013-02-16 06:07:07 +00:00
parent 8c67042b72
commit a9c09aee21
1 changed files with 3 additions and 9 deletions
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12
lib/libc/gen/sem_new.c
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@ -198,15 +198,11 @@ _sem_open(const char *name, int flags, ...)
goto error;
}
fd = _open(path, flags|O_RDWR|O_CLOEXEC, mode);
fd = _open(path, flags|O_RDWR|O_CLOEXEC|O_EXLOCK, mode);
if (fd == -1)
goto error;
if (flock(fd, LOCK_EX) == -1)
if (_fstat(fd, &sb))
goto error;
if (_fstat(fd, &sb)) {
flock(fd, LOCK_UN);
goto error;
}
if (sb.st_size < sizeof(sem_t)) {
sem_t tmp;
@ -214,10 +210,8 @@ _sem_open(const char *name, int flags, ...)
tmp._kern._has_waiters = 0;
tmp._kern._count = value;
tmp._kern._flags = USYNC_PROCESS_SHARED | SEM_NAMED;
if (_write(fd, &tmp, sizeof(tmp)) != sizeof(tmp)) {
flock(fd, LOCK_UN);
if (_write(fd, &tmp, sizeof(tmp)) != sizeof(tmp))
goto error;
}
}
flock(fd, LOCK_UN);
sem = (sem_t *)mmap(NULL, sizeof(sem_t), PROT_READ|PROT_WRITE,