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