Add OpenMP support

third_party/openmp/kmp_wrapper_getpid.h

@@ -0,0 +1,85 @@
+/*
+ * kmp_wrapper_getpid.h -- getpid() declaration.
+ */
+
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef KMP_WRAPPER_GETPID_H
+#define KMP_WRAPPER_GETPID_H
+
+#if KMP_OS_UNIX
+
+// On Unix-like systems (Linux* OS and OS X*) getpid() is declared in standard
+// headers.
+#if !defined(KMP_OS_AIX)
+#include <sys/syscall.h>
+#endif
+#include <sys/types.h>
+#include <unistd.h>
+#if KMP_OS_DARWIN
+// OS X
+#define __kmp_gettid() pthread_mach_thread_np(pthread_self())
+#elif defined(__COSMOPOLITAN__)
+#include "libc/calls/calls.h"
+#define __kmp_gettid() gettid()
+#elif KMP_OS_FREEBSD || KMP_OS_DRAGONFLY
+#include <pthread_np.h>
+#define __kmp_gettid() pthread_getthreadid_np()
+#elif KMP_OS_NETBSD
+#include <lwp.h>
+#define __kmp_gettid() _lwp_self()
+#elif KMP_OS_OPENBSD
+#define __kmp_gettid() getthrid()
+#elif KMP_OS_AIX
+#include <pthread.h>
+#define __kmp_gettid() pthread_self()
+#elif defined(SYS_gettid)
+// Hopefully other Unix systems define SYS_gettid syscall for getting os thread
+// id
+#define __kmp_gettid() syscall(SYS_gettid)
+#else
+#warning No gettid found, use getpid instead
+#define __kmp_gettid() getpid()
+#endif
+
+#elif KMP_OS_WINDOWS
+
+// On Windows* OS _getpid() returns int (not pid_t) and is declared in
+// "process.h".
+#include <process.h>
+// Let us simulate Unix.
+#if KMP_MSVC_COMPAT
+typedef int pid_t;
+#endif
+#define getpid _getpid
+#define __kmp_gettid() GetCurrentThreadId()
+
+#else
+
+#error Unknown or unsupported OS.
+
+#endif
+
+/* TODO: All the libomp source code uses pid_t type for storing the result of
+   getpid(), it is good. But often it printed as "%d", that is not good, because
+   it ignores pid_t definition (may pid_t be longer that int?). It seems all pid
+   prints should be rewritten as:
+
+   printf( "%" KMP_UINT64_SPEC, (kmp_uint64) pid );
+
+   or (at least) as
+
+   printf( "%" KMP_UINT32_SPEC, (kmp_uint32) pid );
+
+   (kmp_uint32, kmp_uint64, KMP_UINT64_SPEC, and KMP_UNIT32_SPEC are defined in
+   "kmp_os.h".)  */
+
+#endif // KMP_WRAPPER_GETPID_H
+
+// end of file //