src/common/compat/tid.h

   1 /*
   2  * Copyright 2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   3  *
   4  * gettid compatibility layer.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to
   8  * deal in the Software without restriction, including without limitation the
   9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  10  * sell copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 #ifndef LTTNG_TID_H
  26 #define LTTNG_TID_H
  27
  28 #ifdef __linux__
  29 #include <syscall.h>
  30 #endif
  31
  32 #if defined(_syscall0)
  33 _syscall0(pid_t, gettid)
  34 #elif defined(__NR_gettid)
  35 #include <unistd.h>
  36 static inline pid_t gettid(void)
  37 {
  38         return syscall(__NR_gettid);
  39 }
  40 #else
  41 #include <sys/types.h>
  42 #include <unistd.h>
  43
  44 /* Fall-back on getpid for tid if not available. */
  45 static inline pid_t gettid(void)
  46 {
  47         return getpid();
  48 }
  49 #endif
  50
  51 #endif /* LTTNG_TID_H */