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Manual Pages  — PTHREAD_GETSPECIFIC

NAME

pthread_getspecific – get a thread-specific data value

CONTENTS

LIBRARY

POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

#include <pthread.h>

void *
pthread_getspecific(pthread_key_t key);

DESCRIPTION

The pthread_getspecific() function returns the value currently bound to the specified key on behalf of the calling thread.

The effect of calling pthread_getspecific() with a key value not obtained from pthread_key_create() or after key has been deleted with pthread_key_delete() is undefined.

The pthread_getspecific() function may be called from a thread-specific data destructor function. A call to pthread_getspecific() for the thread-specific data key being destroyed returns the value NULL, unless the value is changed (after the destructor starts) by a call to pthread_setspecific().

RETURN VALUES

The pthread_getspecific() function will return the thread-specific data value associated with the given key. If no thread-specific data value is associated with key, then the value NULL is returned.

ERRORS

None.

SEE ALSO

pthread_key_create(3), pthread_key_delete(3), pthread_setspecific(3)

STANDARDS

The pthread_getspecific() function conforms to IEEE Std 1003.1-96 ("POSIX.1").

PTHREAD_GETSPECIFIC (3) April 4, 1996

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