C++ semaphore_destroy函数代码示例

void
_dispatch_semaphore_dispose(dispatch_object_t dou)
{
	dispatch_semaphore_t dsema = dou._dsema;

	if (dsema->dsema_value < dsema->dsema_orig) {
		DISPATCH_CLIENT_CRASH(
				"Semaphore/group object deallocated while in use");
	}

#if USE_MACH_SEM
	kern_return_t kr;
	if (dsema->dsema_port) {
		kr = semaphore_destroy(mach_task_self(), dsema->dsema_port);
		DISPATCH_SEMAPHORE_VERIFY_KR(kr);
	}
	if (dsema->dsema_waiter_port) {
		kr = semaphore_destroy(mach_task_self(), dsema->dsema_waiter_port);
		DISPATCH_SEMAPHORE_VERIFY_KR(kr);
	}
#elif USE_POSIX_SEM
	int ret = sem_destroy(&dsema->dsema_sem);
	DISPATCH_SEMAPHORE_VERIFY_RET(ret);
#endif
}

static void _ringbuffer_stream_deallocate( stream_t* stream )
{
	ringbuffer_stream_t* buffer = (ringbuffer_stream_t*)stream;

	semaphore_destroy( &buffer->signal_read );
	semaphore_destroy( &buffer->signal_write );
}

/* Performs any initialization of the miniroute layer, if required. */
void
miniroute_initialize()
{
    network_get_my_address(hostaddr);
    discovery_alarm = -1;

    intrpt_buffer = queue_new();
    intrpt_sig = semaphore_create();
    discovery_mutex = semaphore_create();
    discovery_sig = semaphore_create();

    route_cache = miniroute_cache_new(65536, SIZE_OF_ROUTE_CACHE, MINIROUTE_CACHED_ROUTE_EXPIRE);
    disc_cache = miniroute_cache_new(65536, SIZE_OF_ROUTE_CACHE, MINIROUTE_CACHED_ROUTE_EXPIRE * 10);

    if (NULL == intrpt_buffer || NULL == intrpt_sig || NULL == route_cache
            || NULL == discovery_mutex || NULL == discovery_sig) {
        queue_free(intrpt_buffer);
        semaphore_destroy(intrpt_sig);
        semaphore_destroy(discovery_mutex);
        semaphore_destroy(discovery_sig);
        miniroute_cache_destroy(route_cache);
        return;
    }

    semaphore_initialize(intrpt_sig, 0);
    semaphore_initialize(discovery_mutex, 1);
    semaphore_initialize(discovery_sig, 0);

    network_get_my_address(hostaddr);

    minithread_fork(miniroute_control, NULL);
}

/* Delete the route request struct */
void delete_route_request(route_request_t route_request)
{
	if (route_request->interrupt_arg != NULL)
		free(route_request->interrupt_arg);

	semaphore_destroy(route_request->initiator_sem);
	semaphore_destroy(route_request->waiting_sem);
	free(route_request);
}

//Destroys minisockets
void minisocket_destroy(minisocket_t minisocket, int FIN) {
	int portNumber;
	int i, threads;
	interrupt_level_t prev_level;
	minisocket_error error;

	if (minisocket == NULL)
		return;

	portNumber = minisocket->port_number;

	semaphore_P(destroy_semaphore);

	minisocket->waiting = TCP_PORT_WAITING_TO_CLOSE;

	if (minisockets[portNumber] == NULL)
		return;

	semaphore_V(minisocket->packet_ready);

	semaphore_P(minisocket->mutex);

	if (minisockets[portNumber] == NULL)
		return;

	if (FIN == 1) {
		transmit_packet(minisocket, minisocket->destination_addr, minisocket->destination_port,
				1, MSG_FIN, 0, NULL, &error);
	}

	minisocket->status = TCP_PORT_CLOSING;

	prev_level = set_interrupt_level(DISABLED);
	threads = minisocket->num_waiting_on_mutex;

	for (i = 0; i < threads; i++)
	{
		semaphore_V(minisocket->mutex);
		i++;
	}
	set_interrupt_level(prev_level);

	minisockets[portNumber] = NULL;

	semaphore_destroy(minisocket->wait_for_ack_semaphore);
	semaphore_destroy(minisocket->mutex);
	semaphore_destroy(minisocket->packet_ready);

	if (minisocket->data_length != 0)
		free(minisocket->data_buffer);

	queue_free(minisocket->waiting_packets);

	free(minisocket);

	semaphore_V(destroy_semaphore);
}

static void end(void)
{
	shared_memory_destroy(shm_id);
	semaphore_destroy(semaphore_1);
	semaphore_destroy(semaphore_2);
	/*semaphore_destroy(consumer_lock);
	semaphore_destroy(producer_lock);
	semaphore_destroy(free_id);
	semaphore_destroy(busy_id);*/
}

int
main(void)
{
    pthread_t     pthread1, pthread2, pthread3;
    semaphore_t*   sem = g_sem;
    kern_return_t kr;

    setbuf(stdout, NULL);

    kr = semaphore_create(mach_task_self(), &sem[0], SYNC_POLICY_FIFO, 0);
    OUT_ON_MACH_ERROR("semaphore_create", kr);

    kr = semaphore_create(mach_task_self(), &sem[1], SYNC_POLICY_FIFO, 0);
    OUT_ON_MACH_ERROR("semaphore_create", kr);

    (void)pthread_create(&pthread1, (const pthread_attr_t *)0,
                         start_routine, (void *) 0);
    printf("created thread1=%lx\n", 0);

    (void)pthread_create(&pthread2, (const pthread_attr_t *)0,
                         start_routine, (void *) 1);
    printf("created thread2=%lx\n", 1);

    (void)pthread_create(&pthread3, (const pthread_attr_t *)0,
                         start_routine, (void *) 2);
    printf("created thread3=%lx\n", 2);

    // wait until all three threads are ready
    SEMAPHORE_WAIT(sem[1], 3);

//    printf("main: about to signal thread3\n");
//    semaphore_signal_thread(sem[0], pthread_mach_thread_np(pthread3));

    // wait for thread3 to sem_signal()
//    semaphore_wait(sem[1]);

    sleep(1);
    printf("main: about to signal all threads\n");
    semaphore_signal_all(sem[0]);

    // wait for thread1 and thread2 to sem_signal()
    SEMAPHORE_WAIT(sem[1], 3);

out:
    if (sem[0])
        semaphore_destroy(mach_task_self(), sem[0]);
    if (sem[1])
        semaphore_destroy(mach_task_self(), sem[1]);

    exit(kr);
}

int main(int argc, char *argv[])
{
    int s, ns;
    int semaphore_id;
    int shared_memory_id = 0;
    uint16_t port;
    pid_t pid;
    struct sockaddr_in client;
    char *tmp_shm_addr;
    shm_t *g_shm;

    check_args(&argc, argv, 0);

    port = (uint16_t) atoi(argv[1]);
    create_tcp_socket(&s, port);

    semaphore_id = semaphore_new(SEM_KEY);
    v(semaphore_id, 1);

    shared_memory_id = create_shared_memory(SHM_KEY);
    tmp_shm_addr = associate_shared_memory(shared_memory_id);
    g_shm = (shm_t *) tmp_shm_addr;


    while (true) {

        accept_new_connection(&s, &ns, &client);

        if ((pid = fork()) == 0)

            shandler(&ns, semaphore_id, client, g_shm);

        else {
            if (pid > 0)

                fprintf(stderr, "#%d# Father - Created child process: %d\n", getpid(), pid);

            else {
                fprintf(stderr, "The fork() function has failed: %s!\n", strerror(errno));
                shared_memory_destroy(shared_memory_id);
                semaphore_destroy(semaphore_id);
                exit(EXIT_FAILURE);
            }
        }
    }

    shared_memory_destroy(shared_memory_id);
    semaphore_destroy(semaphore_id);

    exit(EXIT_SUCCESS);
}

DECLARE_TEST( semaphore, threaded )
{
	object_t thread[32];
	int ith;
	int failed_waits;

	semaphore_test_t test;
	semaphore_initialize( &test.read, 0 );
	semaphore_initialize( &test.write, 0 );
	test.loopcount = 128;
	test.counter = 0;
	
	for( ith = 0; ith < 32; ++ith )
	{
		thread[ith] = thread_create( semaphore_waiter, "semaphore_waiter", THREAD_PRIORITY_NORMAL, 0 );
		thread_start( thread[ith], &test );
	}

	test_wait_for_threads_startup( thread, 32 );

	failed_waits = 0;
	for( ith = 0; ith < test.loopcount * 32; ++ith )
	{
		semaphore_post( &test.read );
		thread_yield();
		if( !semaphore_try_wait( &test.write, 200 ) )
		{
			failed_waits++;
			EXPECT_TRUE( semaphore_wait( &test.write ) );
		}
	}

	for( ith = 0; ith < 32; ++ith )
	{
		thread_terminate( thread[ith] );
		thread_destroy( thread[ith] );
		thread_yield();
	}

	test_wait_for_threads_exit( thread, 32 );

	EXPECT_EQ( test.counter, test.loopcount * 32 );
	EXPECT_EQ( failed_waits, 0 );

	semaphore_destroy( &test.read );
	semaphore_destroy( &test.write );
	
	return 0;
}

static void minisocket_free (minisocket_t * socket) {
  network_interrupt_arg_t *packet = NULL;
  while (queue_dequeue(socket->data, (void **)&packet) != -1) {
    free(packet);
  }
  queue_free(socket->data);
  socket->data = NULL;
  semaphore_destroy(socket->data_ready);
  semaphore_destroy(socket->wait_for_ack);
  semaphore_destroy(socket->send_receive_mutex);
  semaphore_P(ports_mutex);
  ports[socket->local_port] = NULL;
  semaphore_V(ports_mutex);
  free(socket);
}

/* Initializes the minisocket layer. */
void minisocket_initialize()
{
  int i;
  sock_array = (minisocket_t*)malloc(sizeof(struct minisocket)*NUM_SOCKETS);
  if (!sock_array) {
    return;
  }
  for (i = 0; i < NUM_SOCKETS; i++) {
    sock_array[i] = NULL;
  }
  client_lock = semaphore_create();
  if (!client_lock) {
    free(sock_array);
    return;
  }
  server_lock = semaphore_create();
  if (!server_lock) {
    free(sock_array);
    semaphore_destroy(client_lock);
    return;
  }
  semaphore_initialize(client_lock, 1);
  semaphore_initialize(server_lock, 1);
  network_get_my_address(my_addr);
  curr_client_idx = CLIENT_START;
  //printf("minisocket_initialize complete\n");
}

BLOCKDEVICEP 
blockdevice_create(char *name, int blocksize, int numblocks)
{
	BLOCKDEVICEP devp ;
	int rc ;

	if (blocksize != REAL_BLOCK_LENGTH) {
		/*
		** For now we simplify things and just force
		** all blockdevices to have 1k block sizes.
		** We can fix this assumption up later.
		*/
		return NULL ;
	}

	if (strlen(name) >= BLOCK_DEV_MAX_NAME_LEN) {
		return NULL ;
	}

	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_create(1234, 0) ;
	devp->dirtysem = semaphore_create(1235, 0) ;

	/*if (! devp->sem) {
		free(devp) ;
		return NULL ;
	}*/

	strcpy(devp->name, name) ;
	devp->blocksize = blocksize ;
	devp->numblocks = numblocks ;
	devp->lastblockchecked = 0 ;

	rc = shmem_open() ;

	if (0 == rc) {
		semaphore_destroy(devp->sem, 1) ;
		free(devp->name) ;
		free(devp) ;
		return NULL ;
	}

	devp->bd = (struct SHMEM_BLOCK_OVERLAY *) shmem_get_memptr() ;

	initialize_block_dev_shmem(devp->bd, blocksize, numblocks, name) ;

	return devp ;
}

void
_dispatch_sema4_create_slow(_dispatch_sema4_t *s4, int policy)
{
	semaphore_t tmp = MACH_PORT_NULL;

	_dispatch_fork_becomes_unsafe();

	// lazily allocate the semaphore port

	// Someday:
	// 1) Switch to a doubly-linked FIFO in user-space.
	// 2) User-space timers for the timeout.

#if DISPATCH_USE_OS_SEMAPHORE_CACHE
	if (policy == _DSEMA4_POLICY_FIFO) {
		tmp = (_dispatch_sema4_t)os_get_cached_semaphore();
		if (!os_atomic_cmpxchg(s4, MACH_PORT_NULL, tmp, relaxed)) {
			os_put_cached_semaphore((os_semaphore_t)tmp);
		}
		return;
	}
#endif

	kern_return_t kr = semaphore_create(mach_task_self(), &tmp, policy, 0);
	DISPATCH_SEMAPHORE_VERIFY_KR(kr);

	if (!os_atomic_cmpxchg(s4, MACH_PORT_NULL, tmp, relaxed)) {
		kr = semaphore_destroy(mach_task_self(), tmp);
		DISPATCH_SEMAPHORE_VERIFY_KR(kr);
	}
}

Semaphore::~Semaphore()
{
	kern_return_t result = semaphore_destroy(mach_task_self(), mSemaphore);

	if(KERN_SUCCESS != result)
		LOGGER_ERR("org.sbooth.AudioEngine.Semaphore", "semaphore_destroy failed: " << mach_error_string(result));
}

int syscall_sem_destroy(usr_sem_t* handle)
{
  int i;
  interrupt_status_t intr_status;

  intr_status = _interrupt_disable();
  spinlock_acquire(&usr_semaphore_table_slock);

  /* Look through the user semaphore table for
   * a usr_sem_t address matching the handle */
  for(i = 0; i < MAX_USR_SEMAPHORES; i++) {
    if(&usr_semaphore_table[i] == handle) {
      /* Invalidate the kernel semaphore and set the entry
       * in the userland semaphore table to empty */
      semaphore_destroy(handle->sem);
      usr_semaphore_table[i].sem = NULL;
      spinlock_release(&usr_semaphore_table_slock);
      _interrupt_set_state(intr_status);
      return 0;
    }
  }
  // If no match is found, return an error
  spinlock_release(&usr_semaphore_table_slock);
  _interrupt_set_state(intr_status);
  return 1;
}