main()
{
SEMAPHOREP sem ;
int rc ;
int i ;
sem = semaphore_open(1234) ;
if (!sem) {
printf("semaphore_open() failed\n") ;
exit(1) ;
}
for (i = 0; i < 10; i++) {
printf("Releasing semaphore iteration %d\n", i) ;
rc = semaphore_increment(sem) ;
if (! rc) {
printf("semaphore_increment() failed\n") ;
exit(1) ;
}
sleep(1) ;
}
rc = semaphore_destroy(sem, 0) ;
if (! rc) {
printf("semaphore_destroy(sem, 0) failed\n") ;
exit(1) ;
}
exit(0) ;
}
int
main(int argc, const char** argv)
{
semaphore_t *semap;
semap = semaphore_open("/tmp/semaphore");
if (semap == NULL) return 1;
semaphore_post(semap);
semaphore_close(semap);
return 0;
}
int semaphore_create()
{
int flag_sem = O_CREAT|O_RDWR;
int init_value = 1;
semaphore_unlink(SEM_NAME);
if (semaphore_open(SEM_NAME, flag_sem, FILE_MODE, init_value) == -1)
{
perror("semaphore_create fail");
return -1;
}
return 0;
}
void
netcmd_semaphore_init (void)
{
semaphore_open (&netcmd_semaphore, PACKAGE "_netcmd");
}
named_semaphore_wrapper
(detail::create_enum_t type, const char *name, mode_t mode, unsigned int count)
{ semaphore_open(mp_sem, type, name, mode, count); }
named_semaphore_wrapper
(ipcdetail::create_enum_t type, const char *name, unsigned int count, const permissions &perm = permissions())
{ semaphore_open(mp_sem, type, name, count, perm); }
BLOCKDEVICEP
blockdevice_open(char *name)
{
BLOCKDEVICEP devp ;
int rc ;
/*
** Shared memory has only been setup for 1 block device (currently).
** This makes open really easy. We just attach to the shared memory
** segment, suck the header information out, fill up our structure,
** and away we go. Of course, there is absolutely no error checking
** here (yet), we could run into the case where the shared memory
** has not been created yet. We'll worry about this later. Iterate,
** iterate, iterate.
*/
devp = malloc(sizeof(BLOCKDEVICE)) ;
if (NULL == devp) {
return NULL ;
}
devp->name = malloc(strlen(name)+1) ;
if (NULL == devp->name) {
free(devp) ;
return NULL ;
}
devp->sem = semaphore_open(1234) ;
if (! devp->sem) {
free(devp) ;
return NULL ;
}
devp->dirtysem = semaphore_open(1235) ;
if (! devp->dirtysem) {
free(devp) ;
return NULL ;
}
rc = shmem_open() ;
if (0 == rc) {
semaphore_destroy(devp->sem, 0) ;
semaphore_destroy(devp->dirtysem, 0) ;
free(devp->name) ;
free(devp) ;
return NULL ;
}
devp->bd = (struct SHMEM_BLOCK_OVERLAY *) shmem_get_memptr() ;
strcpy(devp->name, name) ;
devp->blocksize = devp->bd->header.blocksize ;
devp->numblocks = devp->bd->header.numblocks ;
return devp ;
}
posix_named_semaphore(open_only_t, const char *name)
{
semaphore_open(mp_sem, DoOpen, name);
}
posix_named_semaphore(open_or_create_t, const char *name, unsigned int initialCount, const permissions &perm = permissions())
{
semaphore_open(mp_sem, DoOpenOrCreate, name, initialCount, perm);
}