add tool and tests for binding threads according to a set of locations

Author: ndenoyelle

config/hwloc_internal.m4

@@ -355,6 +355,34 @@ EOF
       AC_CHECK_FUNCS([clock_gettime])
     ])
 
+    # Check for ptrace support
+    hwloc_have_ptrace=1
+    AC_CHECK_HEADERS([sys/ptrace.h],, [hwloc_have_ptrace=0])
+    AC_CHECK_FUNCS([ptrace],, [hwloc_have_ptrace=0])
+    AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ 
+        #include "sys/ptrace.h"
+        int main(void){
+	  return ptrace(PTRACE_SEIZE,
+	                -1,
+			0,
+			(void*)(PTRACE_O_TRACECLONE|PTRACE_O_TRACEFORK));
+	}
+      ]])],, [hwloc_have_ptrace=0])      
+    AM_CONDITIONAL([HWLOC_HAVE_PTRACE],[test $hwloc_have_ptrace -eq 1])
+    AC_DEFINE_UNQUOTED([HWLOC_HAVE_PTRACE], [$hwloc_have_ptrace], [Whether ptrace is present and supports PTRACE_SEIZE or not])
+
+    # Check if syscall gettid is available.
+    hwloc_have_sys_gettid=1
+    AC_CHECK_HEADERS([sys/syscall.h],, [hwloc_have_sys_gettid=0])
+    AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+       #include "sys/syscall.h"
+       #ifndef SYS_gettid
+       #error "syscall SYS_gettid not found"
+       #endif
+       int main(void){ return syscall(SYS_gettid) > 0;}
+    ]])],,[hwloc_have_sys_gettid=0])
+    AC_DEFINE_UNQUOTED([HWLOC_HAVE_SYS_GETTID], [$hwloc_have_sys_gettid], [Whether syscall header is present and SYS_gettid macro is defined or not])
+
     # Only generate this if we're building the utilities
     # Even the netloc library Makefile is here because
     # we don't embed libnetloc yet, it's useless without tools
@@ -385,7 +413,11 @@ AC_DEFUN([HWLOC_SETUP_TESTS],[
 ###
 EOF
 
-    AC_CHECK_LIB([pthread], [pthread_self], [hwloc_have_pthread=yes])
+    # Check thread support.
+    AC_CHECK_LIB([pthread], [pthread_self], [hwloc_have_pthread=1], [hwloc_have_pthread=0])
+    AC_DEFINE_UNQUOTED([HWLOC_HAVE_PTHREAD], [$hwloc_have_pthread], [Whether we have the pthread library or not])
+    AM_CONDITIONAL([HWLOC_HAVE_PTHREAD], [test $hwloc_have_pthread -eq 1]) AC_CHECK_LIB([pthread], [pthread_self], [hwloc_have_pthread=yes])
+    AC_OPENMP
 
     HWLOC_PKG_CHECK_MODULES([NUMA], [numa], [numa_available], [numa.h],
                             [hwloc_have_linux_libnuma=yes],

utils/hwloc/test-hwloc-thread-bind.c

@@ -213,7 +213,7 @@ static int check_strategy_pthread(int prebind)
 /*                    Check sequential, parallel, fork                     */
 /***************************************************************************/
 
-static void test_attach_parallel(int (*check_fn)(int))
+static void test_attach(int (*check_fn)(int))
 {
 	pid_t pid = fork();
 	assert(pid >= 0);
@@ -284,15 +284,15 @@ int main(void)
 #if HWLOC_HAVE_PTRACE	
 #ifdef _OPENMP
 	test_parallel(check_strategy_openmp);
-	test_attach_parallel(check_strategy_openmp);
+	//test_attach(check_strategy_openmp);
 	// OpenMP doesn't like to fork and hangs..
 	/* test_attach_parallel(check_strategy_openmp, cpuaffinity_round_robin); */
 	// OpenMP doesn't like to fork and hangs..	
 	/* test_attach_parallel(check_strategy_openmp, cpuaffinity_scatter); */
 #endif // _OPENMP
 #if HWLOC_HAVE_PTHREAD
 	test_parallel(check_strategy_pthread);
-	test_attach_parallel(check_strategy_pthread);
+	test_attach(check_strategy_pthread);
 #endif // HWLOC_HAVE_PTHREAD
 #endif // HWLOC_HAVE_PTRACE
 #endif // HWLOC_HAVE_SYS_GETTID