HP-UX Reference (11i v2 07/12) - 2 System Calls (vol 5)

pause(2) pause(2)

NAME

pause() - suspend process until signal

SYNOPSIS

#include <unistd.h>

int pause(void);

DESCRIPTION

pause() suspends the calling process until it receives a signal. The signal must be one that is not

currently set to be ignored or blocked (masked) by the calling process.

If the signal causes termination of the calling process,

pause() does not return.

If the signal is caught by the calling process and control is returned from the signal-catching function (see

signal(5)), the calling process resumes execution from the point of suspension; with a return value of -1

from

pause() and errno set to [EINTR].

WARNING

Check all references to signal(5) for appropriateness on systems that support sigvector (2).

sigvec-

tor()

can affect the behavior described on this page.

APPLICATION USAGE

Threads Considerations

Signal dispositions (such as catch/default/ignore) are shared by all threads in the process and blocked signal

masks are maintained by each thread. Therefore, the signals being waited for should not be ignored by the

process or blocked by the calling thread.

pause() will suspend only the calling thread until it receives a signal.

If other threads in the process do not block the signal, the signal may be delivered to another thread in the

process and the thread in pause() may continue waiting. For this reason, the use of

sigwait() is

recommended instead of

pause() for multi-threaded applications.

For more information regarding signals and threads, refer to signal(5).