pthread_setspecific man page on Ultrix

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pthread_setspecific(3thr)			     pthread_setspecific(3thr)

Name
       pthread_setspecific  -  Sets the per-thread context associated with the
       specified key for the current thread.

Syntax
       #include <pthread.h>

       int pthread_setspecific (key, value)
       pthread_key_t key;
       pthread_attr_t value;

Arguments
       key     Context key value that uniquely identifies the context cell  to
	       receive	 value.	  This	 key   value  must  be	obtained  from
	       pthread_keycreate.

       value   Address containing data associated with the specified  key  for
	       the current thread; this is the per-thread context.

Description
       This  routine sets the per-thread context associated with the specified
       key for the current thread. If a context is defined for the key in this
       thread  (the  current  value is not null), the new value is substituted
       for it.

       Different threads can bind different values to the same key. These val‐
       ues  are	 typically  pointers to blocks of dynamically allocated memory
       that are reserved for use by the calling thread.

Return Values
       If an error condition occurs, this routine returns -1 and sets errno to
       the corresponding error value.  Possible return values are as follows.

       Return	Error	   Description
       0		   Successful  comple‐
			   tion.

       -1	[EINVAL]   The	key  value  is
			   invalid.

						     pthread_setspecific(3thr)
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