线程函数pthread_cleanup

线程函数pthread_cleanup_push()

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发布时间：2019-05-09

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NAME

pthread_cleanup_push, pthread_cleanup_pop - establish cancellation handlers

SYNOPSIS

#include <>void pthread_cleanup_push(void (*routine)(void*), void *arg);void pthread_cleanup_pop(int execute);

DESCRIPTION

The
pthread_cleanup_push() function pushes the specified cancellation cleanup handler
routine onto the calling thread's cancellation cleanup stack. The cancellation cleanup handler is popped from the cancellation cleanup stack and invoked with the argument
arg when: (a) the thread exits (that is, calls
), (b) the thread acts upon a cancellation request, or (c) the thread calls
pthread_cleanup_pop() with a non-zero
execute argument.

The pthread_cleanup_pop() function removes the routine at the top of the calling thread's cancellation cleanup stack and optionally invokes it (if execute is non-zero).

These functions may be implemented as macros and will appear as statements and in pairs within the same lexical scope (that is, the pthread_cleanup_push() macro may 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 calling or is undefined if there have been any calls to pthread_cleanup_push() or pthread_cleanup_pop() made without the matching call since the jump buffer was filled. The effect of calling or from inside a cancellation cleanup handler is also undefined unless the jump buffer was also filled in the cancellation cleanup handler.