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PTHREAD_SUSPEND_NP(3) Library Functions Manual PTHREAD_SUSPEND_NP(3) NAME pthread_suspend_np, pthread_resume_np - suspend/resume the given thread LIBRARY POSIX Threads Library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> int pthread_suspend_np(pthread_t thread); int pthread_resume_np(pthread_t thread); DESCRIPTION The pthread_suspend_np() function suspends the thread given as argument. If thread is the currently running thread as returned by pthread_self(3), the function fails and returns EDEADLK. Otherwise, it removes the named thread from the running queue, and adds it to the suspended queue. The thread will remain blocked until pthread_resume_np() is called on it. In other words, pthread_resume_np() resumes the thread given as argument, if it was suspended. RETURN VALUES Both functions return 0 on success and an error number indicating the reason for the failure. COMPATIBILITY These functions are non-standard extensions. ERRORS The pthread_suspend_np() function may fail if: [EDEADLK] The thread requested to suspend was the currently running thread. [ESRCH] The supplied thread was invalid. The pthread_resume_np() function may fail if: [ESRCH] The supplied thread was invalid. NOTES Some pthread_suspend_np() implementations may allow suspending the current thread. This is dangerous, because the semantics of the function would then require the scheduler to schedule another thread, causing a thread context switch. Since that context switch can happen in a signal handler by someone calling pthread_suspend_np() in a signal handler, this is currently not allowed. In pthread_resume_np() the NetBSD implementation does not check if the thread argument is not already suspended. Some implementations might return an error condition if pthread_resume_np() is called on a non- suspended thread. SEE ALSO pthread_attr_setcreatesuspend_np(3), pthread_self(3) NetBSD 8.0 July 9, 2010 NetBSD 8.0