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><A
NAME="POSIX-SYNCHRONIZATION">Synchronization &#0091;POSIX Section 11&#0093;</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13150">Functions Implemented</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>int sem&#0095;init(sem&#0095;t &#0042;sem, int pshared, unsigned int value);
int sem&#0095;destroy(sem&#0095;t &#0042;sem);
int sem&#0095;wait(sem&#0095;t &#0042;sem);
int sem&#0095;trywait(sem&#0095;t &#0042;sem);
int sem&#0095;post(sem&#0095;t &#0042;sem);
int sem&#0095;getvalue(sem&#0095;t &#0042;sem, int &#0042;sval);
int pthread&#0095;mutexattr&#0095;init( pthread&#0095;mutexattr&#0095;t &#0042;attr);
int pthread&#0095;mutexattr&#0095;destroy( pthread&#0095;mutexattr&#0095;t &#0042;attr);
int pthread&#0095;mutex&#0095;init(pthread&#0095;mutex&#0095;t &#0042;mutex,
                       const pthread&#0095;mutexattr&#0095;t &#0042;mutex&#0095;attr);
int pthread&#0095;mutex&#0095;destroy(pthread&#0095;mutex&#0095;t &#0042;mutex);
int pthread&#0095;mutex&#0095;lock(pthread&#0095;mutex&#0095;t &#0042;mutex);
int pthread&#0095;mutex&#0095;trylock(pthread&#0095;mutex&#0095;t &#0042;mutex);
int pthread&#0095;mutex&#0095;unlock(pthread&#0095;mutex&#0095;t &#0042;mutex);
int pthread&#0095;condattr&#0095;init(pthread&#0095;condattr&#0095;t &#0042;attr);
int pthread&#0095;condattr&#0095;destroy(pthread&#0095;condattr&#0095;t &#0042;attr);
int pthread&#0095;cond&#0095;init(pthread&#0095;cond&#0095;t &#0042;cond,
                       const pthread&#0095;condattr&#0095;t &#0042;attr);
int pthread&#0095;cond&#0095;destroy(pthread&#0095;cond&#0095;t &#0042;cond);
int pthread&#0095;cond&#0095;signal(pthread&#0095;cond&#0095;t &#0042;cond);
int pthread&#0095;cond&#0095;broadcast(pthread&#0095;cond&#0095;t &#0042;cond);
int pthread&#0095;cond&#0095;wait(pthread&#0095;cond&#0095;t &#0042;cond,
                       pthread&#0095;mutex&#0095;t &#0042;mutex);
int pthread&#0095;cond&#0095;timedwait(pthread&#0095;cond&#0095;t &#0042;cond,
                           pthread&#0095;mutex&#0095;t &#0042;mutex,
                           const struct timespec &#0042;abstime);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13153">Functions Omitted</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>sem&#0095;t &#0042;sem&#0095;open(const char &#0042;name, int oflag, ...);             &#0047;&#0047; TBA
int sem&#0095;close(sem&#0095;t &#0042;sem);                                    &#0047;&#0047; TBA
int sem&#0095;unlink(const char &#0042;name);                           &#0047;&#0047; TBA
int pthread&#0095;mutexattr&#0095;getpshared( const pthread&#0095;mutexattr&#0095;t &#0042;attr,
                                  int &#0042;pshared );
int pthread&#0095;mutexattr&#0095;setpshared( const pthread&#0095;mutexattr&#0095;t &#0042;attr,
                                  int pshared );
int  pthread&#0095;condattr&#0095;getpshared( const pthread&#0095;condattr&#0095;t &#0042;attr,
                                  int &#0042;pshared);
int  pthread&#0095;condattr&#0095;setpshared( const pthread&#0095;condattr&#0095;t &#0042;attr,
                                  int pshared);</PRE
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN13156">Notes</H2
><P
></P
><UL
><LI
><P
>           The presence of semaphores is controlled by the
            CYGPKG&#0095;POSIX&#0095;SEMAPHORES option. This in turn
            causes the &#0095;POSIX&#0095;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&#0095;init()</I
></SPAN
> is not implemented,
            its value is ignored.
            </P
></LI
><LI
><P
>           Functions <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sem&#0095;open()</I
></SPAN
>,
            <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sem&#0095;close()</I
></SPAN
> and
            <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>sem&#0095;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
            &#0095;POSIX&#0095;THREAD&#0095;PRIO&#0095;INHERIT and
            &#0095;POSIX&#0095;THREAD&#0095;PRIO&#0095;PROTECT
            configuration options.
            </P
></LI
><LI
><P
>           &#0123;&#0095;POSIX&#0095;THREAD&#0095;PROCESS&#0095;SHARED&#0125; 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&#0095;mutexattr&#0095;getpshared()</I
></SPAN
>,
            <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>pthread&#0095;mutexattr&#0095;setpshared()</I
></SPAN
>,
            <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>pthread&#0095;condattr&#0095;getpshared()</I
></SPAN
> and
            <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>pthread&#0095;condattr&#0095;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&#0095;cond&#0095;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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81			`CLASS="SECT1"`
82			`><H1`
83			`CLASS="SECT1"`
84			`><A`
85			`NAME="POSIX-SYNCHRONIZATION">Synchronization [POSIX Section 11]</H1`
86			`><DIV`
87			`CLASS="SECT2"`
88			`><H2`
89			`CLASS="SECT2"`
90			`><A`
91			`NAME="AEN13150">Functions Implemented</H2`
92			`><TABLE`
93			`BORDER="5"`
94			`BGCOLOR="#E0E0F0"`
95			`WIDTH="70%"`
96			`><TR`
97			`><TD`
98			`><PRE`
99			`CLASS="SCREEN"`
100			`>int sem_init(sem_t *sem, int pshared, unsigned int value);`
101			`int sem_destroy(sem_t *sem);`
102			`int sem_wait(sem_t *sem);`
103			`int sem_trywait(sem_t *sem);`
104			`int sem_post(sem_t *sem);`
105			`int sem_getvalue(sem_t sem, int sval);`
106			`int pthread_mutexattr_init( pthread_mutexattr_t *attr);`
107			`int pthread_mutexattr_destroy( pthread_mutexattr_t *attr);`
108			`int pthread_mutex_init(pthread_mutex_t *mutex,`
109			`const pthread_mutexattr_t *mutex_attr);`
110			`int pthread_mutex_destroy(pthread_mutex_t *mutex);`
111			`int pthread_mutex_lock(pthread_mutex_t *mutex);`
112			`int pthread_mutex_trylock(pthread_mutex_t *mutex);`
113			`int pthread_mutex_unlock(pthread_mutex_t *mutex);`
114			`int pthread_condattr_init(pthread_condattr_t *attr);`
115			`int pthread_condattr_destroy(pthread_condattr_t *attr);`
116			`int pthread_cond_init(pthread_cond_t *cond,`
117			`const pthread_condattr_t *attr);`
118			`int pthread_cond_destroy(pthread_cond_t *cond);`
119			`int pthread_cond_signal(pthread_cond_t *cond);`
120			`int pthread_cond_broadcast(pthread_cond_t *cond);`
121			`int pthread_cond_wait(pthread_cond_t *cond,`
122			`pthread_mutex_t *mutex);`
123			`int pthread_cond_timedwait(pthread_cond_t *cond,`
124			`pthread_mutex_t *mutex,`
125			`const struct timespec *abstime);</PRE`
126			`></TD`
127			`></TR`
128			`></TABLE`
129			`></DIV`
130			`><DIV`
131			`CLASS="SECT2"`
132			`><H2`
133			`CLASS="SECT2"`
134			`><A`
135			`NAME="AEN13153">Functions Omitted</H2`
136			`><TABLE`
137			`BORDER="5"`
138			`BGCOLOR="#E0E0F0"`
139			`WIDTH="70%"`
140			`><TR`
141			`><TD`
142			`><PRE`
143			`CLASS="SCREEN"`
144			`>sem_t sem_open(const char name, int oflag, ...); // TBA`
145			`int sem_close(sem_t *sem); // TBA`
146			`int sem_unlink(const char *name); // TBA`
147			`int pthread_mutexattr_getpshared( const pthread_mutexattr_t *attr,`
148			`int *pshared );`
149			`int pthread_mutexattr_setpshared( const pthread_mutexattr_t *attr,`
150			`int pshared );`
151			`int pthread_condattr_getpshared( const pthread_condattr_t *attr,`
152			`int *pshared);`
153			`int pthread_condattr_setpshared( const pthread_condattr_t *attr,`
154			`int pshared);</PRE`
155			`></TD`
156			`></TR`
157			`></TABLE`
158			`></DIV`
159			`><DIV`
160			`CLASS="SECT2"`
161			`><H2`
162			`CLASS="SECT2"`
163			`><A`
164			`NAME="AEN13156">Notes</H2`
165			`><P`
166			`></P`
167			`><UL`
168			`><LI`
169			`><P`
170			`> The presence of semaphores is controlled by the`
171			`CYGPKG_POSIX_SEMAPHORES option. This in turn`
172			`causes the _POSIX_SEMAPHORES feature test`
173			`macro to be defined and the semaphore API to be made`
174			`available.`
175			`</P`
176			`></LI`
177			`><LI`
178			`><P`
179			`> The <SPAN`
180			`CLASS="strong"`
181			`><B`
182			`CLASS="EMPHASIS"`
183			`>pshared</B`
184			`></SPAN`
185			`> argument to`
186			`<SPAN`
187			`CLASS="emphasis"`
188			`><I`
189			`CLASS="EMPHASIS"`
190			`>sem_init()</I`
191			`></SPAN`
192			`> is not implemented,`
193			`its value is ignored.`
194			`</P`
195			`></LI`
196			`><LI`
197			`><P`
198			`> Functions <SPAN`
199			`CLASS="emphasis"`
200			`><I`
201			`CLASS="EMPHASIS"`
202			`>sem_open()</I`
203			`></SPAN`
204			`>,`
205			`<SPAN`
206			`CLASS="emphasis"`
207			`><I`
208			`CLASS="EMPHASIS"`
209			`>sem_close()</I`
210			`></SPAN`
211			`> and`
212			`<SPAN`
213			`CLASS="emphasis"`
214			`><I`
215			`CLASS="EMPHASIS"`
216			`>sem_unlink()</I`
217			`></SPAN`
218			`> are present but`
219			`always return an error (ENOSYS).`
220			`</P`
221			`></LI`
222			`><LI`
223			`><P`
224			`> The exact priority inversion protocols supported may be`
225			`controlled with the`
226			`_POSIX_THREAD_PRIO_INHERIT and`
227			`_POSIX_THREAD_PRIO_PROTECT`
228			`configuration options.`
229			`</P`
230			`></LI`
231			`><LI`
232			`><P`
233			`> {_POSIX_THREAD_PROCESS_SHARED} is`
234			`not defined, so the`
235			`<SPAN`
236			`CLASS="strong"`
237			`><B`
238			`CLASS="EMPHASIS"`
239			`>process-shared</B`
240			`></SPAN`
241			`> mutex`
242			`and condition variable attributes are not supported, and`
243			`neither are the functions`
244			`<SPAN`
245			`CLASS="emphasis"`
246			`><I`
247			`CLASS="EMPHASIS"`
248			`>pthread_mutexattr_getpshared()</I`
249			`></SPAN`
250			`>,`
251			`<SPAN`
252			`CLASS="emphasis"`
253			`><I`
254			`CLASS="EMPHASIS"`
255			`>pthread_mutexattr_setpshared()</I`
256			`></SPAN`
257			`>,`
258			`<SPAN`
259			`CLASS="emphasis"`
260			`><I`
261			`CLASS="EMPHASIS"`
262			`>pthread_condattr_getpshared()</I`
263			`></SPAN`
264			`> and`
265			`<SPAN`
266			`CLASS="emphasis"`
267			`><I`
268			`CLASS="EMPHASIS"`
269			`>pthread_condattr_setpshared()</I`
270			`></SPAN`
271			`>.`
272			`</P`
273			`></LI`
274			`><LI`
275			`><P`
276			`> Condition variables do not become bound to a particular`
277			`mutex when`
278			`<SPAN`
279			`CLASS="emphasis"`
280			`><I`
281			`CLASS="EMPHASIS"`
282			`>pthread_cond_wait()</I`
283			`></SPAN`
284			`> is`
285			`called. Hence different threads may wait on a condition`
286			`variable with different mutexes. This is at variance with`
287			`the standard, which requires a condition variable to`
288			`become (dynamically) bound by the first waiter, and`
289			`unbound when the last finishes. However, this difference`
290			`is largely benign, and the cost of policing this feature`
291			`is non-trivial.`
292			`</P`
293			`></LI`
294			`></UL`
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346			`><A`
347			`HREF="posix-standard-support.html"`
348			`ACCESSKEY="U"`
349			`>Up</A`
350			`></TD`
351			`><TD`
352			`WIDTH="33%"`
353			`ALIGN="right"`
354			`VALIGN="top"`
355			`>Memory Management [POSIX Section 12]</TD`
356			`></TR`
357			`></TABLE`
358			`></DIV`
359			`></BODY`
360			`></HTML`
361			`>`

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