libc/src/pthread/pthread_create.cpp

   1 //===-- Linux implementation of the pthread_create function ---------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "pthread_create.h"
  10
  11 #include "src/__support/common.h"
  12 #include "src/__support/threads/thread.h"
  13
  14 #include <errno.h>
  15 #include <pthread.h> // For pthread_* type definitions.
  16
  17 namespace __llvm_libc {
  18
  19 static_assert(sizeof(pthread_t) == sizeof(__llvm_libc::Thread),
  20               "Mismatch between pthread_t and internal Thread.");
  21
  22 LLVM_LIBC_FUNCTION(int, pthread_create,
  23                    (pthread_t *__restrict th, const pthread_attr_t *__restrict,
  24                     __pthread_start_t func, void *arg)) {
  25   auto *thread = reinterpret_cast<__llvm_libc::Thread *>(th);
  26   // TODO: Use the attributes parameter to set up thread properties.
  27   int result = thread->run(func, arg, nullptr, 0);
  28   if (result != 0 && result != EPERM)
  29     return EAGAIN;
  30   return result;
  31 }
  32
  33 } // namespace __llvm_libc