Implement functions pthread_getaffinity_np and pthread_setaffinity_np to

get and set thread's cpu affinity mask.

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/libthr/thread/thr_affinity.c b/lib/libthr/thread/thr_affinity.c
new file mode 100644
index 0000000..240dd74
--- /dev/null
+++ b/lib/libthr/thread/thr_affinity.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2008, David Xu <davidxu@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ */
+
+#include "namespace.h"
+#include <pthread.h>
+#include <sys/param.h>
+#include <sys/cpuset.h>
+#include "un-namespace.h"
+
+#include "thr_private.h"
+
+__weak_reference(_pthread_getaffinity_np, pthread_getaffinity_np);
+__weak_reference(_pthread_setaffinity_np, pthread_setaffinity_np);
+
+int
+_pthread_setaffinity_np(pthread_t td, size_t cpusetsize, const cpuset_t *cpuset)
+{
+	struct pthread	*curthread = _get_curthread();
+	lwpid_t		tid;
+	int		error;
+
+	THR_THREAD_LOCK(curthread, td);
+	if (td->state == PS_DEAD) {
+		THR_THREAD_UNLOCK(curthread, td);
+		return (EINVAL);
+	}
+	tid = TID(td);
+	error = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid,
+	    cpusetsize, cpuset);
+	if (error == -1)
+		error = errno;
+	THR_THREAD_UNLOCK(curthread, td);
+	return (error);
+}
+
+int
+_pthread_getaffinity_np(pthread_t td, size_t cpusetsize, cpuset_t *cpuset)
+{
+	lwpid_t tid;
+	int error;
+
+	tid = TID(td);
+	error = cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid,
+	    cpusetsize, cpuset);
+	if (error == -1)
+		error = errno;
+	return (error);
+}