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->Synchronization [POSIX Section 11]</TITLE
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-><A
-NAME="POSIX-SYNCHRONIZATION">Synchronization [POSIX Section 11]</H1
-><DIV
-CLASS="SECT2"
-><H2
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-><A
-NAME="AEN13150">Functions Implemented</H2
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->int sem_init(sem_t *sem, int pshared, unsigned int value);
-int sem_destroy(sem_t *sem);
-int sem_wait(sem_t *sem);
-int sem_trywait(sem_t *sem);
-int sem_post(sem_t *sem);
-int sem_getvalue(sem_t *sem, int *sval);
-int pthread_mutexattr_init( pthread_mutexattr_t *attr);
-int pthread_mutexattr_destroy( pthread_mutexattr_t *attr);
-int pthread_mutex_init(pthread_mutex_t *mutex,
- const pthread_mutexattr_t *mutex_attr);
-int pthread_mutex_destroy(pthread_mutex_t *mutex);
-int pthread_mutex_lock(pthread_mutex_t *mutex);
-int pthread_mutex_trylock(pthread_mutex_t *mutex);
-int pthread_mutex_unlock(pthread_mutex_t *mutex);
-int pthread_condattr_init(pthread_condattr_t *attr);
-int pthread_condattr_destroy(pthread_condattr_t *attr);
-int pthread_cond_init(pthread_cond_t *cond,
- const pthread_condattr_t *attr);
-int pthread_cond_destroy(pthread_cond_t *cond);
-int pthread_cond_signal(pthread_cond_t *cond);
-int pthread_cond_broadcast(pthread_cond_t *cond);
-int pthread_cond_wait(pthread_cond_t *cond,
- pthread_mutex_t *mutex);
-int pthread_cond_timedwait(pthread_cond_t *cond,
- pthread_mutex_t *mutex,
- const struct timespec *abstime);</PRE
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-><H2
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-><A
-NAME="AEN13153">Functions Omitted</H2
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-><PRE
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->sem_t *sem_open(const char *name, int oflag, ...); // TBA
-int sem_close(sem_t *sem); // TBA
-int sem_unlink(const char *name); // TBA
-int pthread_mutexattr_getpshared( const pthread_mutexattr_t *attr,
- int *pshared );
-int pthread_mutexattr_setpshared( const pthread_mutexattr_t *attr,
- int pshared );
-int pthread_condattr_getpshared( const pthread_condattr_t *attr,
- int *pshared);
-int pthread_condattr_setpshared( const pthread_condattr_t *attr,
- int pshared);</PRE
-></TD
-></TR
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-></DIV
-><DIV
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-><H2
-CLASS="SECT2"
-><A
-NAME="AEN13156">Notes</H2
-><P
-></P
-><UL
-><LI
-><P
-> The presence of semaphores is controlled by the
- CYGPKG_POSIX_SEMAPHORES option. This in turn
- causes the _POSIX_SEMAPHORES feature test
- macro to be defined and the semaphore API to be made
- available.
- </P
-></LI
-><LI
-><P
-> The <SPAN
-CLASS="strong"
-><B
-CLASS="EMPHASIS"
->pshared</B
-></SPAN
-> argument to
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->sem_init()</I
-></SPAN
-> is not implemented,
- its value is ignored.
- </P
-></LI
-><LI
-><P
-> Functions <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->sem_open()</I
-></SPAN
->,
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->sem_close()</I
-></SPAN
-> and
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->sem_unlink()</I
-></SPAN
-> are present but
- always return an error (ENOSYS).
- </P
-></LI
-><LI
-><P
-> The exact priority inversion protocols supported may be
- controlled with the
- _POSIX_THREAD_PRIO_INHERIT and
- _POSIX_THREAD_PRIO_PROTECT
- configuration options.
- </P
-></LI
-><LI
-><P
-> {_POSIX_THREAD_PROCESS_SHARED} is
- not defined, so the
- <SPAN
-CLASS="strong"
-><B
-CLASS="EMPHASIS"
->process-shared</B
-></SPAN
-> mutex
- and condition variable attributes are not supported, and
- neither are the functions
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->pthread_mutexattr_getpshared()</I
-></SPAN
->,
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->pthread_mutexattr_setpshared()</I
-></SPAN
->,
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->pthread_condattr_getpshared()</I
-></SPAN
-> and
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->pthread_condattr_setpshared()</I
-></SPAN
->.
- </P
-></LI
-><LI
-><P
-> Condition variables do not become bound to a particular
- mutex when
- <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->pthread_cond_wait()</I
-></SPAN
-> is
- called. Hence different threads may wait on a condition
- variable with different mutexes. This is at variance with
- the standard, which requires a condition variable to
- become (dynamically) bound by the first waiter, and
- unbound when the last finishes. However, this difference
- is largely benign, and the cost of policing this feature
- is non-trivial.
- </P
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