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12 .TH PTHREAD_JOIN 3C "Mar 23, 2005"
14 pthread_join \- wait for thread termination
18 cc -mt [ \fIflag\fR... ] \fIfile\fR... -lpthread [ \fIlibrary\fR... ]
21 \fBint\fR \fBpthread_join\fR(\fBpthread_t\fR \fIthread\fR, \fBvoid **\fR\fIstatus\fR);
27 The \fBpthread_join()\fR function suspends processing of the calling thread
28 until the target \fIthread\fR completes. \fIthread\fR must be a member of the
29 current process and it cannot be a detached thread. See
30 \fBpthread_create\fR(3C).
33 If two or more threads wait for the same thread to complete, all will suspend
34 processing until the thread has terminated, and then one thread will return
35 successfully and the others will return with an error of \fBESRCH\fR. The
36 \fBpthread_join()\fR function will not block processing of the calling thread
37 if the target \fIthread\fR has already terminated.
40 If a \fBpthread_join()\fR call returns successfully with a non-null
41 \fIstatus\fR argument, the value passed to \fBpthread_exit\fR(3C) by the
42 terminating thread will be placed in the location referenced by \fIstatus\fR.
45 If the \fBpthread_join()\fR calling thread is cancelled, then the target
46 \fIthread\fR will remain joinable by \fBpthread_join()\fR. However, the calling
47 thread may set up a cancellation cleanup handler on \fIthread\fR prior to the
48 join call, which may detach the target \fIthread\fR by calling
49 \fBpthread_detach\fR(3C). See \fBpthread_detach\fR(3C) and
50 \fBpthread_cancel\fR(3C).
54 If successful, \fBpthread_join()\fR returns \fB0\fR. Otherwise, an error number
55 is returned to indicate the error.
63 A joining deadlock would occur, such as when a thread attempts to wait for
73 The thread corresponding to the given thread ID is a detached thread.
82 No thread could be found corresponding to the given thread ID.
88 See \fBattributes\fR(5) for descriptions of the following attributes:
96 ATTRIBUTE TYPE ATTRIBUTE VALUE
98 Interface Stability Standard
106 \fBpthread_cancel\fR(3C), \fBpthread_create\fR(3C), \fBpthread_detach\fR(3C),
107 \fBpthread_exit\fR(3C), \fBwait\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)
111 The pthread_join(3C) function must specify the \fIthread\fR \fBID\fR for whose
112 termination it will wait.
115 Calling \fBpthread_join()\fR also "detaches" the thread; that is,
116 \fBpthread_join()\fR includes the effect of the \fBpthread_detach()\fR
117 function. If a thread were to be cancelled when blocked in
118 \fBpthread_join()\fR, an explicit detach would have to be performed in the
119 cancellation cleanup handler. The \fBpthread_detach()\fR function exists
120 primarily for this purpose.