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Diffstat (limited to 'include/uapi/linux/membarrier.h')
-rw-r--r-- | include/uapi/linux/membarrier.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/include/uapi/linux/membarrier.h b/include/uapi/linux/membarrier.h new file mode 100644 index 0000000..e0b108b --- /dev/null +++ b/include/uapi/linux/membarrier.h @@ -0,0 +1,53 @@ +#ifndef _UAPI_LINUX_MEMBARRIER_H +#define _UAPI_LINUX_MEMBARRIER_H + +/* + * linux/membarrier.h + * + * membarrier system call API + * + * Copyright (c) 2010, 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +/** + * enum membarrier_cmd - membarrier system call command + * @MEMBARRIER_CMD_QUERY: Query the set of supported commands. It returns + * a bitmask of valid commands. + * @MEMBARRIER_CMD_SHARED: Execute a memory barrier on all running threads. + * Upon return from system call, the caller thread + * is ensured that all running threads have passed + * through a state where all memory accesses to + * user-space addresses match program order between + * entry to and return from the system call + * (non-running threads are de facto in such a + * state). This covers threads from all processes + * running on the system. This command returns 0. + * + * Command to be passed to the membarrier system call. The commands need to + * be a single bit each, except for MEMBARRIER_CMD_QUERY which is assigned to + * the value 0. + */ +enum membarrier_cmd { + MEMBARRIER_CMD_QUERY = 0, + MEMBARRIER_CMD_SHARED = (1 << 0), +}; + +#endif /* _UAPI_LINUX_MEMBARRIER_H */ |