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kmp_wrapper_getpid.h
1 /*
2  * kmp_wrapper_getpid.h -- getpid() declaration.
3  */
4 
5 //===----------------------------------------------------------------------===//
6 //
7 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
8 // See https://llvm.org/LICENSE.txt for license information.
9 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef KMP_WRAPPER_GETPID_H
14 #define KMP_WRAPPER_GETPID_H
15 
16 #if KMP_OS_UNIX
17 
18 // On Unix-like systems (Linux* OS and OS X*) getpid() is declared in standard
19 // headers.
20 #include <sys/syscall.h>
21 #include <sys/types.h>
22 #include <unistd.h>
23 #if KMP_OS_DARWIN
24 // OS X
25 #define __kmp_gettid() syscall(SYS_thread_selfid)
26 #elif KMP_OS_NETBSD
27 #include <lwp.h>
28 #define __kmp_gettid() _lwp_self()
29 #elif defined(SYS_gettid)
30 // Hopefully other Unix systems define SYS_gettid syscall for getting os thread
31 // id
32 #define __kmp_gettid() syscall(SYS_gettid)
33 #else
34 #warning No gettid found, use getpid instead
35 #define __kmp_gettid() getpid()
36 #endif
37 
38 #elif KMP_OS_WINDOWS
39 
40 // On Windows* OS _getpid() returns int (not pid_t) and is declared in
41 // "process.h".
42 #include <process.h>
43 // Let us simulate Unix.
44 #if KMP_MSVC_COMPAT
45 typedef int pid_t;
46 #endif
47 #define getpid _getpid
48 #define __kmp_gettid() GetCurrentThreadId()
49 
50 #else
51 
52 #error Unknown or unsupported OS.
53 
54 #endif
55 
56 /* TODO: All the libomp source code uses pid_t type for storing the result of
57  getpid(), it is good. But often it printed as "%d", that is not good, because
58  it ignores pid_t definition (may pid_t be longer that int?). It seems all pid
59  prints should be rewritten as:
60 
61  printf( "%" KMP_UINT64_SPEC, (kmp_uint64) pid );
62 
63  or (at least) as
64 
65  printf( "%" KMP_UINT32_SPEC, (kmp_uint32) pid );
66 
67  (kmp_uint32, kmp_uint64, KMP_UINT64_SPEC, and KMP_UNIT32_SPEC are defined in
68  "kmp_os.h".) */
69 
70 #endif // KMP_WRAPPER_GETPID_H
71 
72 // end of file //