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pthread_cleanup_push(3) [netbsd man page]

PTHREAD_CLEANUP(3)					   BSD Library Functions Manual 					PTHREAD_CLEANUP(3)

pthread_cleanup_push, pthread_cleanup_pop -- add and remove cleanup functions for thread exit LIBRARY
POSIX Threads Library (libpthread, -lpthread) SYNOPSIS
#include <pthread.h> void pthread_cleanup_push(void (*cleanup_routine)(void *), void *arg); void pthread_cleanup_pop(int execute); DESCRIPTION
The pthread_cleanup_push() function adds cleanup_routine to the top of the stack of cleanup handlers that get called when the current thread exits. The pthread_cleanup_pop() function pops the top cleanup routine off of the current threads cleanup routine stack, and, if execute is non- zero, it will execute the function. When cleanup_routine is called, it is passed arg as its only argument. These functions may be implemented as macros which contain scope delimiters; therefore, there must be a matching pthread_cleanup_pop() for every pthread_cleanup_push() at the same level of lexical scoping. The effect of calling longjmp() or siglongjmp() is undefined after a call to pthread_cleanup_push() but before the matching call to pthread_cleanup_pop() after the jump buffer was filled. RETURN VALUES
Neither pthread_cleanup_push() nor pthread_cleanup_pop() returns a value. ERRORS
pthread_exit(3) STANDARDS
Both functions conform to IEEE Std 1003.1-2001 (``POSIX.1''). BSD
July 9, 2010 BSD

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pthread_cleanup_push(3C)												  pthread_cleanup_push(3C)

pthread_cleanup_push - push a thread cancellation cleanup handler SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ] #include <pthread.h> void pthread_cleanup_push(void (*handler, void *),void *arg); The pthread_cleanup_push() function pushes the specified cancellation cleanup handler routine, handler, onto the cancellation cleanup stack of the calling thread. When a thread exits or is canceled and its cancellation cleanup stack is not empty, the cleanup handlers are invoked with the argument arg in last in, first out (LIFO) order from the cancellation cleanup stack. The pthread_cleanup_push() and pthread_cleanup_pop(3C) functions can be implemented as macros. The application must ensure that they appear as statements, and in pairs within the same lexical scope (that is, the pthread_cleanup_push() macro can be thought to expand to a token list whose first token is '{' with pthread_cleanup_pop() expanding to a token list whose last token is the corresponding '}'). The effect of the use of return, break, continue, and goto to prematurely leave a code block described by a pair of pthread_cleanup_push() and pthread_cleanup_pop() function calls is undefined. Using longjmp() or siglongjmp() to jump into or out of a push/pop pair can cause either the matching push or the matching pop statement not getting executed. The pthread_cleanup_push() function returns no value. No errors are defined. The pthread_cleanup_push() function will not return an error code of EINTR. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ longjmp(3C), pthread_cancel(3C), pthread_cleanup_pop(3C), pthread_exit(3C), pthread_join(3C), pthread_setcancelstate(3C), pthread_set- canceltype(3C), pthread_testcancel(3C), attributes(5), cancellation(5), condition(5), standards(5) See cancellation(5) for a discussion of cancellation concepts. 4 Oct 2005 pthread_cleanup_push(3C)
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