c/pthread_extra/pthread_user_data.c

   1 #define __PTHREAD_EXTRA_INTERNAL
   2
   3 #include <pthread.h>
   4 #include <pthread_extra.h>
   5
   6 //Static array with user data for all thread handles
   7 //TODO: perhaps use something more sophisticated like linked list?
   8 pthread_user_data_internal_t pthread_user_data[PTHREAD_XTHREADS_MAX+1] = {{.tid=PTHREAD_XNULL}};
   9
  10 //Get pointer to internal record tied to specified thread
  11 pthread_user_data_internal_t* pthread_user_data_internal(pthread_t thread) {
  12         //Return NULL if requested thread handle is NULL
  13         if(pthread_equal(thread, PTHREAD_XNULL)) return NULL;
  14
  15         //Find if the thread is already registered, add it if not
  16         //FIXME: recycle slots of destroyed threads!!!
  17         pthread_t i;
  18         for(i = 0; i<PTHREAD_XTHREADS_MAX; i++) {
  19                 if(pthread_equal(pthread_user_data[i].tid, PTHREAD_XNULL)) {
  20                         pthread_user_data[i].tid = thread;
  21                         pthread_user_data[i+1].tid = PTHREAD_XNULL;
  22                         break;
  23                 }
  24                 if(pthread_equal(pthread_user_data[i].tid, thread)) break;
  25         }
  26         //Return pointer
  27         return &pthread_user_data[i];
  28 }
  29
  30 //Get pointer to user specified pointer of that thread
  31 void** pthread_user_data_ptr(pthread_t thread) {
  32         return &pthread_user_data_internal(thread)->usr;
  33 }
  34
  35 //Set user specified pointer for thread
  36 void pthread_user_data_set(pthread_t thread, void *usr) {
  37         *(pthread_user_data_ptr(thread)) = usr;
  38 }
  39
  40 //Get user specified pointer for thread
  41 void* pthread_user_data_get(pthread_t thread) {
  42         return *(pthread_user_data_ptr(thread));
  43 }