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All Rights Reserved. .\" Copyright (c) 2000 Sun Microsystems, Inc. All Rights Reserved. .\" Copyright (c) 2001, The IEEE and The Open Group. All Rights Reserved. .\" .TH THR_JOIN 3C "Mar 27, 2000" .SH NAME thr_join \- wait for thread termination .SH SYNOPSIS .LP .nf cc -mt [ \fIflag\fR... ] \fIfile\fR...[ \fIlibrary\fR... ] #include <thread.h> \fBint\fR \fBthr_join\fR(\fBthread_t\fR \fIthread\fR, \fBthread_t *\fR\fIdeparted\fR, \fBvoid **\fR\fIstatus\fR); .fi .SH DESCRIPTION .sp .LP The \fBthr_join()\fR function suspends processing of the calling thread until the target \fIthread\fR completes. The \fIthread\fR argument must be a member of the current process and cannot be a detached thread. See \fBthr_create\fR(3C). .sp .LP If two or more threads wait for the same thread to complete, all will suspend processing until the thread has terminated, and then one thread will return successfully and the others will return with an error of \fBESRCH\fR. The \fBthr_join()\fR function will not block processing of the calling thread if the target \fIthread\fR has already terminated. .sp .LP If a \fBthr_join()\fR call returns successfully with a non-null \fIstatus\fR argument, the value passed to \fBthr_exit\fR(3C) by the terminating thread will be placed in the location referenced by \fIstatus\fR. .sp .LP If the target \fIthread\fR \fBID\fR is \fB0\fR, \fBthr_join()\fR finds and returns the status of a terminated undetached thread in the process. If no such thread exists, it suspends processing of the calling thread until a thread for which no other thread is waiting enters that state, at which time it returns successfully, or until all other threads in the process are either daemon threads or threads waiting in \fBthr_join()\fR, in which case it returns \fBEDEADLK\fR. See \fBNOTES\fR. .sp .LP If \fIdeparted\fR is not \fINULL\fR, it points to a location that is set to the ID of the terminated thread if \fBthr_join()\fR returns successfully. .SH RETURN VALUES .sp .LP If successful, \fBthr_join()\fR returns \fB0\fR. Otherwise, an error number is returned to indicate the error. .SH ERRORS .sp .ne 2 .na \fB\fBEDEADLK\fR \fR .ad .RS 12n A joining deadlock would occur, such as when a thread attempts to wait for itself, or the calling thread is waiting for any thread to exit and only daemon threads or waiting threads exist in the process. .RE .sp .ne 2 .na \fB\fBESRCH\fR \fR .ad .RS 12n No undetached thread could be found corresponding to the given thread ID. .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ MT-Level MT-Safe .TE .SH SEE ALSO .sp .LP \fBthr_create\fR(3C), \fBthr_exit\fR(3C), \fBwait\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5) .SH NOTES .sp .LP Using thr_join(3C) in the following syntax, .sp .in +2 .nf while (thr_join(0, NULL, NULL) == 0); .fi .in -2 .sp .LP will wait for the termination of all non-daemon threads, excluding threads that are themselves waiting in \fBthr_join()\fR.