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+'\" et
+.TH PTHREAD_BARRIER_WAIT "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+pthread_barrier_wait
+\(em synchronize at a barrier
+.SH SYNOPSIS
+.LP
+.nf
+#include <pthread.h>
+.P
+int pthread_barrier_wait(pthread_barrier_t *\fIbarrier\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIpthread_barrier_wait\fR()
+function shall synchronize participating threads at the barrier
+referenced by
+.IR barrier .
+The calling thread shall block until the required number of
+threads have called
+\fIpthread_barrier_wait\fR()
+specifying the barrier.
+.P
+When the required number of threads have called
+\fIpthread_barrier_wait\fR()
+specifying the barrier, the constant PTHREAD_BARRIER_SERIAL_THREAD
+shall be returned to one unspecified thread and zero shall be returned
+to each of the remaining threads. At this point, the barrier shall be
+reset to the state it had as a result of the most recent
+\fIpthread_barrier_init\fR()
+function that referenced it.
+.P
+The constant PTHREAD_BARRIER_SERIAL_THREAD is defined in
+.IR <pthread.h> 
+and its value shall be distinct from any other value returned by
+\fIpthread_barrier_wait\fR().
+.P
+The results are undefined if this function is called with an
+uninitialized barrier.
+.P
+If a signal is delivered to a thread blocked on a barrier, upon return
+from the signal handler the thread shall resume waiting at the barrier
+if the barrier wait has not completed (that is, if the required number
+of threads have not arrived at the barrier during the execution of the
+signal handler); otherwise, the thread shall continue as normal from
+the completed barrier wait. Until the thread in the signal handler
+returns from it, it is unspecified whether other threads may proceed
+past the barrier once they have all reached it.
+.P
+A thread that has blocked on a barrier shall not prevent any unblocked
+thread that is eligible to use the same processing resources from
+eventually making forward progress in its execution. Eligibility for
+processing resources shall be determined by the scheduling policy.
+.SH "RETURN VALUE"
+Upon successful completion, the
+\fIpthread_barrier_wait\fR()
+function shall return PTHREAD_BARRIER_SERIAL_THREAD for a single
+(arbitrary) thread synchronized at the barrier and zero for each of the
+other threads. Otherwise, an error number shall be returned to indicate
+the error.
+.SH ERRORS
+This function shall not return an error code of
+.BR [EINTR] .
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+Applications using this function may be subject to priority inversion,
+as discussed in the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 3.291" ", " "Priority Inversion".
+.SH RATIONALE
+If an implementation detects that the value specified by the
+.IR barrier
+argument to
+\fIpthread_barrier_wait\fR()
+does not refer to an initialized barrier object, it is recommended
+that the function should fail and report an
+.BR [EINVAL] 
+error.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIpthread_barrier_destroy\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 3.291" ", " "Priority Inversion",
+.IR "Section 4.12" ", " "Memory Synchronization",
+.IR "\fB<pthread.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .