rewrite posix semaphore and mqueue implementation.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1103 bbd45198-f89e-11dd-88c7-29a3b14d5316

6 files changed, 524 insertions, 67 deletions

diff --git a/components/pthreads/mqueue.c b/components/pthreads/mqueue.c
index a3cc2c7c73..bd31b4450a 100644
--- a/components/pthreads/mqueue.c
+++ b/components/pthreads/mqueue.c
@@ -5,6 +5,65 @@
 #include <errno.h>

 #include <sys/fcntl.h>

 

+static posix_mq_t* posix_mq_list = RT_NULL;

+static struct rt_semaphore posix_mq_lock;

+void posix_mq_system_init()

+{

+	rt_sem_init(&posix_mq_lock, "pmq", 1, RT_IPC_FLAG_FIFO);

+}

+

+rt_inline void posix_mq_insert(posix_mq_t *pmq)

+{

+	pmq->next = posix_mq_list;

+	posix_mq_list = pmq;

+}

+

+static void posix_mq_delete(posix_mq_t *pmq)

+{

+	posix_mq_t *iter;

+	if (posix_mq_list == pmq)

+	{

+		posix_mq_list = pmq->next;

+

+		rt_mq_delete(pmq->mq);

+		rt_free(pmq);

+

+		return;

+	}

+	for (iter = posix_mq_list; iter->next != RT_NULL; iter = iter->next)

+	{

+		if (iter->next == pmq)

+		{

+			/* delete this mq */

+			if (pmq->next != RT_NULL)

+				iter->next = pmq->next;

+			else

+				iter->next = RT_NULL;

+

+			/* delete RT-Thread mqueue */

+			rt_mq_delete(pmq->mq);

+			rt_free(pmq);

+			return ;

+		}

+	}

+}

+

+static posix_mq_t *posix_mq_find(const char* name)

+{

+	posix_mq_t *iter;

+	rt_object_t object;

+

+	for (iter = posix_mq_list; iter != RT_NULL; iter = iter->next)

+	{

+		object = (rt_object_t)&(iter->mq);

+

+		if (strncmp(object->name, name, RT_NAME_MAX) == 0)

+		{

+			return iter;

+		}

+	}

+}

+

 int mq_setattr(mqd_t mqdes, const struct mq_attr *mqstat,

 		struct mq_attr *omqstat)

 {

@@ -20,8 +79,8 @@ int mq_getattr(mqd_t mqdes, struct mq_attr *mqstat)
 		return -1;

 	}

 

-	mqstat->mq_maxmsg = mqdes->max_msgs;

-	mqstat->mq_msgsize = mqdes->msg_size;

+	mqstat->mq_maxmsg = mqdes->mq->mq->max_msgs;

+	mqstat->mq_msgsize = mqdes->mq->mq->msg_size;

 	mqstat->mq_curmsgs = 0;

 	mqstat->mq_flags = 0;

 

@@ -30,11 +89,15 @@ int mq_getattr(mqd_t mqdes, struct mq_attr *mqstat)
 

 mqd_t mq_open(const char *name, int oflag, ...)

 {

-	rt_mq_t mq;

+	mqd_t mqdes;

 	va_list arg;

 	mode_t mode;

 	struct mq_attr *attr = RT_NULL;

 

+    /* lock posix mqueue list */

+    rt_sem_take(&posix_mq_lock, RT_WAITING_FOREVER);

+

+    mqdes = RT_NULL;

 	if (oflag & O_CREAT)

 	{

 	    va_start(arg, oflag);

@@ -42,21 +105,82 @@ mqd_t mq_open(const char *name, int oflag, ...)
 	    attr = (struct mq_attr *) va_arg(arg, struct mq_attr *);

 	    va_end(arg);

 

-		mq = rt_mq_create(name, attr->mq_msgsize, attr->mq_maxmsg, RT_IPC_FLAG_FIFO);

-		if (mq == RT_NULL) /* create failed */

+	    if (oflag & O_EXCL)

+	    {

+	    	if (posix_mq_find(name) != RT_NULL)

+	    	{

+	    		rt_set_errno(EEXIST);

+	    		goto __return;

+	    	}

+	    }

+	    mqdes = (mqd_t) rt_malloc (sizeof(struct mqdes));

+	    if (mqdes == RT_NULL)

+	    {

+	    	rt_set_errno(ENFILE);

+	    	goto __return;

+	    }

+

+	    mqdes->flags = oflag;

+	    mqdes->mq = (posix_mq_t*) rt_malloc (sizeof(posix_mq_t));

+	    if (mqdes->mq == RT_NULL)

+	    {

+	    	rt_set_errno(ENFILE);

+	    	goto __return;

+	    }

+

+	    /* create RT-Thread message queue */

+		mqdes->mq->mq = rt_mq_create(name, attr->mq_msgsize, attr->mq_maxmsg, RT_IPC_FLAG_FIFO);

+		if (mqdes->mq->mq == RT_NULL) /* create failed */

 		{

 			rt_set_errno(ENFILE);

-			return RT_NULL;

+			goto __return;

 		}

-	}

+		/* initialize reference count */

+		mqdes->mq->refcount = 1;

+		mqdes->mq->unlinked = 0;

 

-	if (oflag & O_EXCL)

+		/* insert mq to posix mq list */

+		posix_mq_insert(mqdes->mq);

+	}

+	else

 	{

-		mq = (rt_mq_t)rt_object_find(name, RT_Object_Class_MessageQueue);

-		if (mq == RT_NULL) rt_set_errno(ENOSPC);

+		posix_mq_t *mq;

+

+		/* find mqueue */

+		mq = posix_mq_find(name);

+		if (mq != RT_NULL)

+		{

+			mqdes = (mqd_t) rt_malloc (sizeof(struct mqdes));

+			mqdes->mq = mq;

+			mqdes->flags = oflag;

+			mq->refcount ++; /* increase reference count */

+		}

+		else

+		{

+			rt_set_errno(ENOENT);

+			goto __return;

+		}

 	}

+	rt_sem_release(&posix_mq_lock);

+	return mqdes;

 

-	return mq;

+__return:

+	/* release lock */

+	rt_sem_release(&posix_mq_lock);

+

+	/* release allocated memory */

+	if (mqdes != RT_NULL)

+	{

+		if (mqdes->mq != RT_NULL)

+		{

+			/* delete RT-Thread message queue */

+			if (mqdes->mq->mq != RT_NULL)

+				rt_mq_delete(mqdes->mq->mq);

+			rt_free(mqdes->mq);

+		}

+		rt_free(mqdes);

+	}

+	return RT_NULL;

 }

 

 ssize_t mq_receive(mqd_t mqdes, char *msg_ptr, size_t msg_len, unsigned *msg_prio)

@@ -69,7 +193,14 @@ ssize_t mq_receive(mqd_t mqdes, char *msg_ptr, size_t msg_len, unsigned *msg_pri
 		return -1;

 	}

 

-	result = rt_mq_recv(mqdes, msg_ptr, msg_len, RT_WAITING_FOREVER);

+	/* permission check */

+	if (!(mqdes->flags & O_RDONLY))

+	{

+		rt_set_errno(EBADF);

+		return -1;

+	}

+

+	result = rt_mq_recv(mqdes->mq->mq, msg_ptr, msg_len, RT_WAITING_FOREVER);

 	if (result == RT_EOK)

 		return msg_len;

 

@@ -87,7 +218,14 @@ int mq_send(mqd_t mqdes, const char *msg_ptr, size_t msg_len, unsigned msg_prio)
 		return -1;

 	}

 

-	result = rt_mq_send(mqdes, msg_ptr, msg_len);

+	/* permission check */

+	if (!(mqdes->flags & O_WRONLY))

+	{

+		rt_set_errno(EBADF);

+		return -1;

+	}

+

+	result = rt_mq_send(mqdes->mq->mq, (void*)msg_ptr, msg_len);

 	if (result == RT_EOK)

 		return 0;

 

@@ -101,14 +239,22 @@ ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
 	int tick;

 	rt_err_t result;

 

+	/* parameters check */

 	if ((mqdes == RT_NULL) || (msg_ptr == RT_NULL))

 	{

 		rt_set_errno(EINVAL);

 		return -1;

 	}

+	/* permission check */

+	if (!(mqdes->flags & O_RDONLY))

+	{

+		rt_set_errno(EBADF);

+		return -1;

+	}

+

 	tick = libc_time_to_tick(abs_timeout);

 

-	result = rt_mq_recv(mqdes, msg_ptr, msg_len, tick);

+	result = rt_mq_recv(mqdes->mq->mq, msg_ptr, msg_len, tick);

 	if (result == RT_EOK) return msg_len;

 

 	if (result == -RT_ETIMEOUT)

@@ -134,21 +280,49 @@ int mq_notify(mqd_t mqdes, const struct sigevent *notification)
 

 int mq_close(mqd_t mqdes)

 {

-	return 0;

+	if (mqdes == RT_NULL)

+	{

+		rt_set_errno(EINVAL);

+		return -1;

+	}

+

+    /* lock posix mqueue list */

+    rt_sem_take(&posix_mq_lock, RT_WAITING_FOREVER);

+    mqdes->mq->refcount --;

+    if (mqdes->mq->refcount == 0)

+    {

+    	/* delete from posix mqueue list */

+    	if (mqdes->mq->unlinked)

+    		posix_mq_delete(mqdes->mq);

+    	mqdes->mq = RT_NULL;

+    }

+    rt_sem_release(&posix_mq_lock);

+

+    rt_free(mqdes);

+    return 0;

 }

 

 int mq_unlink(const char *name)

 {

-	rt_mq_t mq;

+	posix_mq_t *pmq;

 

-	mq = (rt_mq_t)rt_object_find(name, RT_Object_Class_MessageQueue);

-	if (mq == RT_NULL)

-	{

-		rt_set_errno(ENOENT);

-		return -1;

-	}

+    /* lock posix mqueue list */

+    rt_sem_take(&posix_mq_lock, RT_WAITING_FOREVER);

+    pmq = posix_mq_find(name);

+    if (pmq != RT_NULL)

+    {

+    	pmq->unlinked = 1;

+    	if (pmq->refcount == 0)

+    	{

+    		/* remove this mqueue */

+    		posix_mq_delete(pmq);

+    	}

+        rt_sem_release(&posix_mq_lock);

+        return 0;

+    }

+    rt_sem_release(&posix_mq_lock);

 

-	/* delete this message queue */

-	rt_mq_delete(mq);

-	return 0;

+    /* no this entry */

+    rt_set_errno(ENOENT);

+    return -1;

 }

diff --git a/components/pthreads/mqueue.h b/components/pthreads/mqueue.h
index 80df241d85..fb99e58068 100644
--- a/components/pthreads/mqueue.h
+++ b/components/pthreads/mqueue.h
@@ -7,7 +7,26 @@
 #include <sys/signal.h>

 #include <pthread.h>

 

-typedef rt_mq_t mqd_t;

+struct posix_mq

+{

+	/* reference count and unlinked */

+	rt_uint16_t refcount;

+	rt_uint16_t unlinked;

+

+	/* RT-Thread message queue */

+	rt_mq_t mq;

+	/* next posix mqueue */

+	struct posix_mq* next;

+};

+typedef struct posix_mq posix_mq_t;

+

+struct mqdes

+{

+	rt_uint32_t flags;

+	posix_mq_t* mq;

+};

+typedef struct mqdes* mqd_t;

+

 struct mq_attr

 {

 	long mq_flags; 		/* Message queue flags. */

diff --git a/components/pthreads/pthread.c b/components/pthreads/pthread.c
index e3958a5e20..fc312dfd11 100644
--- a/components/pthreads/pthread.c
+++ b/components/pthreads/pthread.c
@@ -6,6 +6,10 @@ int pthread_system_init(void)
 {

 	/* initialize key area */

 	pthread_key_system_init();

+	/* initialize posix mqueue */

+	posix_mq_system_init();

+	/* initialize posix semaphore */

+	posix_sem_system_init();

 

 	return 0;

 }

diff --git a/components/pthreads/pthread_internal.h b/components/pthreads/pthread_internal.h
index cc0b512ac0..5d00d15091 100644
--- a/components/pthreads/pthread_internal.h
+++ b/components/pthreads/pthread_internal.h
@@ -54,5 +54,7 @@ rt_inline _pthread_data_t* _pthread_get_data(pthread_t thread)
 }

 

 extern int libc_time_to_tick(const struct timespec *time);

+void posix_mq_system_init(void);

+void posix_sem_system_init(void);

 

 #endif

diff --git a/components/pthreads/semaphore.c b/components/pthreads/semaphore.c
index 214f66b42f..6231dc96af 100644
--- a/components/pthreads/semaphore.c
+++ b/components/pthreads/semaphore.c
@@ -4,38 +4,151 @@
 #include <rtthread.h>
 #include "semaphore.h"
 
+static posix_sem_t* posix_sem_list = RT_NULL;
+static struct rt_semaphore posix_sem_lock;
+void posix_sem_system_init()
+{
+	rt_sem_init(&posix_sem_lock, "psem", 1, RT_IPC_FLAG_FIFO);
+}
+
+rt_inline void posix_sem_insert(posix_sem_t *psem)
+{
+	psem->next = posix_sem_list;
+	posix_sem_list = psem;
+}
+
+static void posix_sem_delete(posix_sem_t *psem)
+{
+	posix_sem_t *iter;
+	if (posix_sem_list == psem)
+	{
+		posix_sem_list = psem->next;
+
+		rt_sem_delete(psem->sem);
+		rt_free(psem);
+
+		return;
+	}
+	for (iter = posix_sem_list; iter->next != RT_NULL; iter = iter->next)
+	{
+		if (iter->next == psem)
+		{
+			/* delete this mq */
+			if (psem->next != RT_NULL)
+				iter->next = psem->next;
+			else
+				iter->next = RT_NULL;
+
+			/* delete RT-Thread mqueue */
+			rt_sem_delete(psem->sem);
+			rt_free(psem);
+			return ;
+		}
+	}
+}
+
+static posix_sem_t *posix_sem_find(const char* name)
+{
+	posix_sem_t *iter;
+	rt_object_t object;
+
+	for (iter = posix_sem_list; iter != RT_NULL; iter = iter->next)
+	{
+		object = (rt_object_t)&(iter->sem);
+
+		if (strncmp(object->name, name, RT_NAME_MAX) == 0)
+		{
+			return iter;
+		}
+	}
+}
+
 int sem_close(sem_t *sem)
 {
-	if (!sem) return EINVAL;
+	if (sem == RT_NULL)
+	{
+		rt_set_errno(EINVAL);
+		return -1;
+	}
 
-	/* delete semaphore allocated in sem_open */
-	rt_sem_delete(sem);
-	return 0;
+    /* lock posix semaphore list */
+    rt_sem_take(&posix_sem_lock, RT_WAITING_FOREVER);
+    sem->sem->refcount --;
+    if (sem->sem->refcount == 0)
+    {
+    	/* delete from posix semaphore list */
+    	if (sem->sem->unlinked)
+    		posix_sem_delete(sem->sem);
+    	sem->sem = RT_NULL;
+    }
+    rt_sem_release(&posix_sem_lock);
+
+    rt_free(sem);
+    return 0;
 }
 
 int sem_destroy(sem_t *sem)
 {
 	rt_err_t result;
 
-	if (!sem) return EINVAL;
+	if ((!sem) || !(sem->sem->unamed))
+	{
+		rt_set_errno(EINVAL);
+		return -1;
+	}
 
-	/* check whether semaphore is busy or not */
-	result = rt_sem_trytake(sem);
-	if (result != RT_EOK) return EBUSY;
+    /* lock posix semaphore list */
+    rt_sem_take(&posix_sem_lock, RT_WAITING_FOREVER);
+    result = rt_sem_trytake(sem->sem->sem);
+    if (result != RT_EOK)
+    {
+        rt_sem_release(&posix_sem_lock);
+        rt_set_errno(EBUSY);
+    	return -1;
+    }
 
-	rt_memset(sem, 0, sizeof(sem_t));
-	return 0;
+    /* destroy an unamed posix semaphore */
+   	posix_sem_delete(sem->sem);
+    rt_sem_release(&posix_sem_lock);
+
+    rt_free(sem);
+    return 0;
 }
 
 int sem_unlink(const char *name)
 {
-	return EACCES;
+	posix_sem_t *psem;
+
+    /* lock posix semaphore list */
+    rt_sem_take(&posix_sem_lock, RT_WAITING_FOREVER);
+    psem = posix_sem_find(name);
+    if (psem != RT_NULL)
+    {
+    	psem->unlinked = 1;
+    	if (psem->refcount == 0)
+    	{
+    		/* remove this semaphore */
+    		posix_sem_delete(psem);
+    	}
+        rt_sem_release(&posix_sem_lock);
+        return 0;
+    }
+    rt_sem_release(&posix_sem_lock);
+
+    /* no this entry */
+    rt_set_errno(ENOENT);
+    return -1;
 }
 
 int sem_getvalue(sem_t *sem, int *sval)
 {
-	RT_ASSERT(sem != RT_NULL);
-	if (sval) *sval = sem->value;
+	if (!sem || !sval)
+	{
+		rt_set_errno(EINVAL);
+		return -1;
+	}
+	*sval = sem->sem->sem->value;
+	return 0;
 }
 
 int sem_init(sem_t *sem, int pshared, unsigned int value)
@@ -47,42 +160,146 @@ int sem_init(sem_t *sem, int pshared, unsigned int value)
 	RT_ASSERT(sem != RT_NULL);
 
 	rt_snprintf(name, sizeof(name), "psem%02d", psem_number++);
-	result = rt_sem_init(sem, name, value, RT_IPC_FLAG_FIFO);
-	if (result == RT_EOK)
+	sem->sem = (struct posix_sem*) rt_malloc (sizeof(struct posix_sem));
+	if (sem->sem == RT_NULL)
 	{
-		/* detach kernel object */
-		rt_object_detach(&(sem->parent.parent));
-		return 0;
+		rt_set_errno(EINVAL);
+		return -1;
 	}
+	sem->sem->sem = rt_sem_create(name, value, RT_IPC_FLAG_FIFO);
+	if (sem->sem->sem == RT_NULL)
+	{
+		rt_free(sem->sem);
+		sem->sem = RT_NULL;
+		rt_set_errno(ENOMEM);
+		return -1;
+	}
+
+	/* initialize posix semaphore */
+	sem->sem->refcount = 1;
+	sem->sem->unlinked = 0;
+	sem->sem->unamed = 1;
+    /* lock posix semaphore list */
+    rt_sem_take(&posix_sem_lock, RT_WAITING_FOREVER);
+    posix_sem_insert(sem->sem);
+    rt_sem_release(&posix_sem_lock);
+	sem->flags = 0;
 
-	return ENOSPC;
+	return 0;
 }
 
 sem_t *sem_open(const char *name, int oflag, ...)
 {
-	rt_sem_t sem;
+	sem_t* sem;
+	va_list arg;
+	mode_t mode;
+	unsigned int value;
+
+    sem = RT_NULL;
 
-	sem = RT_NULL;
+    /* lock posix semaphore list */
+    rt_sem_take(&posix_sem_lock, RT_WAITING_FOREVER);
 	if (oflag & O_CREAT)
 	{
-		sem = rt_sem_create(name, 1, RT_IPC_FLAG_FIFO);
-		if (sem == RT_NULL)
-			rt_set_errno(ENOSPC);
-	}
+		va_start(arg, oflag);
+		mode = (mode_t) va_arg( arg, unsigned int);
+		value = va_arg( arg, unsigned int);
+		va_end(arg);
 
-	/* find semaphore */
-	if (oflag & O_EXCL)
-	{
-		sem = (rt_sem_t)rt_object_find(name, RT_Object_Class_Semaphore);
-		if (sem == RT_NULL) rt_set_errno(ENOSPC);
+	    if (oflag & O_EXCL)
+	    {
+	    	if (posix_sem_find(name) != RT_NULL)
+	    	{
+	    		rt_set_errno(EEXIST);
+	    		goto __return;
+	    	}
+	    }
+	    sem = (sem_t*) rt_malloc (sizeof(struct semdes));
+	    if (sem == RT_NULL)
+	    {
+	    	rt_set_errno(ENFILE);
+	    	goto __return;
+	    }
+
+	    sem->flags = oflag;
+	    sem->sem = (posix_sem_t*) rt_malloc (sizeof(posix_sem_t));
+	    if (sem->sem == RT_NULL)
+	    {
+	    	rt_set_errno(ENFILE);
+	    	goto __return;
+	    }
+
+	    /* create RT-Thread semaphore */
+	    sem->sem->sem = rt_sem_create(name, value, RT_IPC_FLAG_FIFO);
+		if (sem->sem->sem == RT_NULL) /* create failed */
+		{
+			rt_set_errno(ENFILE);
+			goto __return;
+		}
+		/* initialize reference count */
+		sem->sem->refcount = 1;
+		sem->sem->unlinked = 0;
+		sem->sem->unamed = 0;
+
+		/* insert semaphore to posix semaphore list */
+		posix_sem_insert(sem->sem);
 	}
+	else
+	{
+		posix_sem_t *psem;
 
+		/* find semaphore */
+		psem = posix_sem_find(name);
+		if (psem != RT_NULL)
+		{
+			sem = (sem_t*) rt_malloc (sizeof(struct semdes));
+			sem->sem = psem;
+			sem->flags = oflag;
+			psem->refcount ++; /* increase reference count */
+		}
+		else
+		{
+			rt_set_errno(ENOENT);
+			goto __return;
+		}
+	}
+	rt_sem_release(&posix_sem_lock);
 	return sem;
+
+__return:
+	/* release lock */
+	rt_sem_release(&posix_sem_lock);
+
+	/* release allocated memory */
+	if (sem != RT_NULL)
+	{
+		if (sem->sem != RT_NULL)
+		{
+			/* delete RT-Thread semaphore */
+			if (sem->sem->sem != RT_NULL)
+				rt_sem_delete(sem->sem->sem);
+			rt_free(sem->sem);
+		}
+		rt_free(sem);
+	}
+	return RT_NULL;
 }
 
 int sem_post(sem_t *sem)
 {
-	rt_sem_release(sem);
+	rt_err_t result;
+
+	if (!sem)
+	{
+		rt_set_errno(EINVAL);
+		return -1;
+	}
+
+	result = rt_sem_release(sem->sem->sem);
+	if (result == RT_EOK) return 0;
+
+	rt_set_errno(EINVAL);
+	return -1;
 }
 
 int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout)
@@ -95,33 +312,54 @@ int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout)
 	/* calculate os tick */
 	tick = libc_time_to_tick(abs_timeout);
 	
-	result = rt_sem_take(sem, tick);
-	if (result == -RT_ETIMEOUT) return ETIMEDOUT;
+	result = rt_sem_take(sem->sem->sem, tick);
+	if (result == -RT_ETIMEOUT)
+	{
+		rt_set_errno(ETIMEDOUT);
+		return -1;
+	}
 	if (result == RT_EOK) return 0;
 
-	return EINTR;
+	rt_set_errno(EINTR);
+	return -1;
 }
 
 int sem_trywait(sem_t *sem)
 {
 	rt_err_t result;
 
-	if (!sem) return EINVAL;
+	if (!sem)
+	{
+		rt_set_errno(EINVAL);
+		return -1;
+	}
 
-	result = rt_sem_take(sem, RT_WAITING_FOREVER);
-	if (result == -RT_ETIMEOUT) return EAGAIN;
+	result = rt_sem_take(sem->sem->sem, RT_WAITING_FOREVER);
+	if (result == -RT_ETIMEOUT)
+	{
+		rt_set_errno(EAGAIN);
+		return -1;
+	}
 	if (result == RT_EOK) return 0;
 
-	return EINTR;
+	rt_set_errno(EINTR);
+	return -1;
 }
 
 int sem_wait(sem_t *sem)
 {
 	rt_err_t result;
 
-	result = rt_sem_take(sem, RT_WAITING_FOREVER);
+	if (!sem)
+	{
+		rt_set_errno(EINVAL);
+		return -1;
+	}
+
+	result = rt_sem_take(sem->sem->sem, RT_WAITING_FOREVER);
 	if (result == RT_EOK) return 0;
 
-	return EINTR;
+	rt_set_errno(EINTR);
+	return -1;
 }
 
diff --git a/components/pthreads/semaphore.h b/components/pthreads/semaphore.h
index 29e2911a54..09e4cab938 100644
--- a/components/pthreads/semaphore.h
+++ b/components/pthreads/semaphore.h
@@ -4,7 +4,27 @@
 #include <rtthread.h>

 #include <sys/time.h>

 

-typedef struct rt_semaphore sem_t;

+struct posix_sem

+{

+	/* reference count and unlinked */

+	rt_uint16_t refcount;

+	rt_uint8_t unlinked;

+	rt_uint8_t unamed;

+

+	/* RT-Thread semaphore */

+	rt_sem_t sem;

+

+	/* next posix semaphore */

+	struct posix_sem* next;

+};

+typedef struct posix_sem posix_sem_t;

+

+struct semdes

+{

+	rt_uint32_t flags;

+	posix_sem_t* sem;

+};

+typedef struct semdes sem_t;

 

 int sem_close(sem_t *sem);

 int sem_destroy(sem_t *sem);