Add OpenBSD support to OpenMP

Summary: This patch permits OpenMP to build and work (with both gcc and clang) on OpenBSD. It mostly follows what was done for FreeBSD and NetBSD, except OpenBSD does not have pthread_getattr_np support, so it follows OS X in that one instance.

Reviewers: #openmp, krytarowski

Reviewed By: krytarowski

Subscribers: guansong, jfb, emaste, mgorny, krytarowski, #openmp

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D34280

5 files changed, 22 insertions, 11 deletions

diff --git a/openmp/runtime/src/kmp.h b/openmp/runtime/src/kmp.h
index 648fca2d121..3a99cded773 100644
--- a/openmp/runtime/src/kmp.h
+++ b/openmp/runtime/src/kmp.h
@@ -1058,6 +1058,10 @@ extern kmp_uint64 __kmp_now_nsec();
 /* TODO: tune for KMP_OS_HURD */
 #define KMP_INIT_WAIT 1024U /* initial number of spin-tests   */
 #define KMP_NEXT_WAIT 512U /* susequent number of spin-tests */
+#elif KMP_OS_OPENBSD
+/* TODO: tune for KMP_OS_OPENBSD */
+#define KMP_INIT_WAIT 1024U /* initial number of spin-tests   */
+#define KMP_NEXT_WAIT 512U /* susequent number of spin-tests */
 #endif
 
 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
diff --git a/openmp/runtime/src/kmp_platform.h b/openmp/runtime/src/kmp_platform.h
index 83801118851..8d46967477e 100644
--- a/openmp/runtime/src/kmp_platform.h
+++ b/openmp/runtime/src/kmp_platform.h
@@ -20,6 +20,7 @@
 #define KMP_OS_DRAGONFLY 0
 #define KMP_OS_FREEBSD 0
 #define KMP_OS_NETBSD 0
+#define KMP_OS_OPENBSD 0
 #define KMP_OS_DARWIN 0
 #define KMP_OS_WINDOWS 0
 #define KMP_OS_CNK 0
@@ -61,6 +62,11 @@
 #define KMP_OS_NETBSD 1
 #endif
 
+#if (defined __OpenBSD__)
+#undef KMP_OS_OPENBSD
+#define KMP_OS_OPENBSD 1
+#endif
+
 #if (defined __bgq__)
 #undef KMP_OS_CNK
 #define KMP_OS_CNK 1
@@ -73,12 +79,12 @@
 
 #if (1 !=                                                                      \
      KMP_OS_LINUX + KMP_OS_DRAGONFLY + KMP_OS_FREEBSD + KMP_OS_NETBSD +        \
-         KMP_OS_DARWIN + KMP_OS_WINDOWS + KMP_OS_HURD)
+         KMP_OS_OPENBSD + KMP_OS_DARWIN + KMP_OS_WINDOWS + KMP_OS_HURD)
 #error Unknown OS
 #endif
 
 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD ||     \
-        KMP_OS_DARWIN || KMP_OS_HURD
+        KMP_OS_OPENBSD || KMP_OS_DARWIN || KMP_OS_HURD
 #undef KMP_OS_UNIX
 #define KMP_OS_UNIX 1
 #endif
diff --git a/openmp/runtime/src/kmp_runtime.cpp b/openmp/runtime/src/kmp_runtime.cpp
index be8d0d10bc6..ef435cd4703 100644
--- a/openmp/runtime/src/kmp_runtime.cpp
+++ b/openmp/runtime/src/kmp_runtime.cpp
@@ -7671,7 +7671,7 @@ __kmp_determine_reduction_method(
 #if KMP_ARCH_X86_64 || KMP_ARCH_PPC64 || KMP_ARCH_AARCH64 || KMP_ARCH_MIPS64
 
 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD ||     \
-    KMP_OS_WINDOWS || KMP_OS_DARWIN || KMP_OS_HURD
+    KMP_OS_OPENBSD || KMP_OS_WINDOWS || KMP_OS_DARWIN || KMP_OS_HURD
 
     int teamsize_cutoff = 4;
 
@@ -7695,7 +7695,7 @@ __kmp_determine_reduction_method(
 #else
 #error "Unknown or unsupported OS"
 #endif // KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD  \
-// || KMP_OS_WINDOWS || KMP_OS_DARWIN
+// || KMP_OS_OPENBSD || KMP_OS_WINDOWS || KMP_OS_DARWIN || KMP_OS_HURD
 
 #elif KMP_ARCH_X86 || KMP_ARCH_ARM || KMP_ARCH_AARCH || KMP_ARCH_MIPS
 
diff --git a/openmp/runtime/src/kmp_wrapper_malloc.h b/openmp/runtime/src/kmp_wrapper_malloc.h
index a3d4f0047d9..b690c515651 100644
--- a/openmp/runtime/src/kmp_wrapper_malloc.h
+++ b/openmp/runtime/src/kmp_wrapper_malloc.h
@@ -94,7 +94,7 @@
 #if KMP_OS_WINDOWS
 #include <malloc.h> // Windows* OS: _alloca() declared in "malloc.h".
 #define alloca _alloca // Allow to use alloca() with no underscore.
-#elif KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#elif KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_OPENBSD
 // Declared in "stdlib.h".
 #elif KMP_OS_UNIX
 #include <alloca.h> // Linux* OS and OS X*: alloc() declared in "alloca".
diff --git a/openmp/runtime/src/z_Linux_util.cpp b/openmp/runtime/src/z_Linux_util.cpp
index 1249ca76758..7b008d74f66 100644
--- a/openmp/runtime/src/z_Linux_util.cpp
+++ b/openmp/runtime/src/z_Linux_util.cpp
@@ -22,7 +22,7 @@
 #include "kmp_wait_release.h"
 #include "kmp_wrapper_getpid.h"
 
-#if !KMP_OS_DRAGONFLY && !KMP_OS_FREEBSD && !KMP_OS_NETBSD
+#if !KMP_OS_DRAGONFLY && !KMP_OS_FREEBSD && !KMP_OS_NETBSD && !KMP_OS_OPENBSD
 #include <alloca.h>
 #endif
 #include <math.h> // HUGE_VAL.
@@ -499,7 +499,7 @@ static void *__kmp_launch_worker(void *thr) {
 #endif /* KMP_BLOCK_SIGNALS */
   void *exit_val;
 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD ||     \
-        KMP_OS_HURD
+        KMP_OS_OPENBSD || KMP_OS_HURD
   void *volatile padding = 0;
 #endif
   int gtid;
@@ -547,7 +547,8 @@ static void *__kmp_launch_worker(void *thr) {
   KMP_CHECK_SYSFAIL("pthread_sigmask", status);
 #endif /* KMP_BLOCK_SIGNALS */
 
-#if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD ||     \
+        KMP_OS_OPENBSD
   if (__kmp_stkoffset > 0 && gtid > 0) {
     padding = KMP_ALLOCA(gtid * __kmp_stkoffset);
   }
@@ -1768,7 +1769,7 @@ static int __kmp_get_xproc(void) {
   int r = 0;
 
 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD ||     \
-        KMP_OS_HURD
+        KMP_OS_OPENBSD || KMP_OS_HURD
 
   r = sysconf(_SC_NPROCESSORS_ONLN);
 
@@ -2014,9 +2015,9 @@ int __kmp_is_address_mapped(void *addr) {
     found = 1;
   }
 
-#elif KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#elif KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_OPENBSD
 
-  // FIXME(DragonFly, FreeBSD, NetBSD): Implement this
+  // FIXME(DragonFly, FreeBSD, NetBSD, OpenBSD): Implement this
   found = 1;
 
 #else