|PTHREAD_EXIT(3P)||POSIX Programmer's Manual||PTHREAD_EXIT(3P)|
void pthread_exit(void *value_ptr);
An implicit call to pthread_exit() is made when a thread other than the thread in which main() was first invoked returns from the start routine that was used to create it. The function's return value shall serve as the thread's exit status.
The behavior of pthread_exit() is undefined if called from a cancellation cleanup handler or destructor function that was invoked as a result of either an implicit or explicit call to pthread_exit().
After a thread has terminated, the result of access to local (auto) variables of the thread is undefined. Thus, references to local variables of the exiting thread should not be used for the pthread_exit() value_ptr parameter value.
The process shall exit with an exit status of 0 after the last thread has been terminated. The behavior shall be as if the implementation called exit() with a zero argument at thread termination time.
The following sections are informative.
Regardless of the method of thread termination, any cancellation cleanup handlers that have been pushed and not yet popped are executed, and the destructors for any existing thread-specific data are executed. This volume of POSIX.1‐2017 requires that cancellation cleanup handlers be popped and called in order. After all cancellation cleanup handlers have been executed, thread-specific data destructors are called, in an unspecified order, for each item of thread-specific data that exists in the thread. This ordering is necessary because cancellation cleanup handlers may rely on thread-specific data.
As the meaning of the status is determined by the application (except when the thread has been canceled, in which case it is PTHREAD_CANCELED), the implementation has no idea what an illegal status value is, which is why no address error checking is done.
The Base Definitions volume of POSIX.1‐2017, <pthread.h>
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|2017||IEEE/The Open Group|