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+'\" et
+.TH SEM_TRYWAIT "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
+sem_trywait,
+sem_wait
+\(em lock a semaphore
+.SH SYNOPSIS
+.LP
+.nf
+#include <semaphore.h>
+.P
+int sem_trywait(sem_t *\fIsem\fP);
+int sem_wait(sem_t *\fIsem\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIsem_trywait\fR()
+function shall lock the semaphore referenced by
+.IR sem
+only if the semaphore is currently not locked; that is, if the
+semaphore value is currently positive. Otherwise, it shall not lock
+the semaphore.
+.P
+The
+\fIsem_wait\fR()
+function shall lock the semaphore referenced by
+.IR sem
+by performing a semaphore lock operation on that semaphore. If the
+semaphore value is currently zero, then the calling thread shall not
+return from the call to
+\fIsem_wait\fR()
+until it either locks the semaphore or the call is interrupted by a
+signal.
+.P
+Upon successful return, the state of the semaphore shall be locked and
+shall remain locked until the
+\fIsem_post\fR()
+function is executed and returns successfully.
+.P
+The
+\fIsem_wait\fR()
+function is interruptible by the delivery of a signal.
+.SH "RETURN VALUE"
+The
+\fIsem_trywait\fR()
+and
+\fIsem_wait\fR()
+functions shall return zero if the calling process successfully
+performed the semaphore lock operation on the semaphore designated by
+.IR sem .
+If the call was unsuccessful, the state of the semaphore shall be
+unchanged, and the function shall return a value of \-1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIsem_trywait\fR()
+function shall fail if:
+.TP
+.BR EAGAIN
+The semaphore was already locked, so it cannot be immediately locked by
+the
+\fIsem_trywait\fR()
+operation.
+.P
+The
+\fIsem_trywait\fR()
+and
+\fIsem_wait\fR()
+functions may fail if:
+.TP
+.BR EDEADLK
+A deadlock condition was detected.
+.TP
+.BR EINTR
+A signal interrupted this function.
+.TP
+.BR EINVAL
+The
+.IR sem
+argument does not refer to a valid semaphore.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+Applications using these functions 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
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIsemctl\fR\^(\|)",
+.IR "\fIsemget\fR\^(\|)",
+.IR "\fIsemop\fR\^(\|)",
+.IR "\fIsem_post\fR\^(\|)",
+.IR "\fIsem_timedwait\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 3.291" ", " "Priority Inversion",
+.IR "Section 4.12" ", " "Memory Synchronization",
+.IR "\fB<semaphore.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 .