compiler/pthread/pthread_self.c

   1 /*
   2   Copyright (C) 2014 Szilard Biro
   3
   4   This software is provided 'as-is', without any express or implied
   5   warranty.  In no event will the authors be held liable for any damages
   6   arising from the use of this software.
   7
   8   Permission is granted to anyone to use this software for any purpose,
   9   including commercial applications, and to alter it and redistribute it
  10   freely, subject to the following restrictions:
  11
  12   1. The origin of this software must not be misrepresented; you must not
  13      claim that you wrote the original software. If you use this software
  14      in a product, an acknowledgment in the product documentation would be
  15      appreciated but is not required.
  16   2. Altered source versions must be plainly marked as such, and must not be
  17      misrepresented as being the original software.
  18   3. This notice may not be removed or altered from any source distribution.
  19 */
  20
  21 #include <stdlib.h>
  22
  23 #include "pthread_intern.h"
  24 #include "debug.h"
  25
  26 pthread_t pthread_self(void)
  27 {
  28     struct Task *task;
  29     pthread_t thread;
  30
  31     D(bug("%s()\n", __FUNCTION__));
  32
  33     task = FindTask(NULL);
  34     thread = GetThreadId(task);
  35
  36     // add non-pthread processes to our list, so we can handle the main thread
  37     if (thread == PTHREAD_THREADS_MAX)
  38     {
  39         ThreadInfo *inf;
  40
  41         ObtainSemaphore(&thread_sem);
  42         thread = GetThreadId(NULL);
  43         if (thread == PTHREAD_THREADS_MAX)
  44         {
  45             // TODO: pthread_self is supposed to always succeed, but we can fail
  46             // here if we run out of thread slots
  47             // this can only happen if too many non-pthread processes call
  48             // this function
  49             //ReleaseSemaphore(&thread_sem);
  50             //return EAGAIN;
  51             abort();
  52         }
  53         inf = GetThreadInfo(thread);
  54         memset(inf, 0, sizeof(ThreadInfo));
  55         NEWLIST((struct List *)&inf->cleanup);
  56         inf->task = task;
  57         ReleaseSemaphore(&thread_sem);
  58     }
  59
  60     return thread;
  61 }