NAME
pthread_setspecific —
set a thread-specific data
value
SYNOPSIS
#include
<pthread.h>
int
pthread_setspecific(pthread_key_t
key, const void
*value);
DESCRIPTION
The
pthread_setspecific()
function associates a thread-specific value with a key
obtained via a previous call to
pthread_key_create().
Different threads can bind different values to the same key. These values
are typically pointers to blocks of dynamically allocated memory that have
been reserved for use by the calling thread.
The effect of calling
pthread_setspecific()
with a key value not obtained from
pthread_key_create()
or after key has been deleted with
pthread_key_delete()
is undefined.
The
pthread_setspecific()
function may be called from a thread-specific data destructor function,
however this may result in lost storage or infinite loops.
RETURN VALUES
If successful, the pthread_setspecific()
function will return zero. Otherwise an error number will be returned to
indicate the error.
ERRORS
The pthread_setspecific() function will
fail if:
- [
ENOMEM] - Insufficient memory exists to associate the value with the key.
- [
EINVAL] - The key value is invalid.
SEE ALSO
pthread_getspecific(3), pthread_key_create(3), pthread_key_delete(3)
STANDARDS
The pthread_setspecific() function
conforms to ISO/IEC 9945-1:1996
(“POSIX.1”).