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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/uapi/linux/membarrier.h
1 #ifndef _UAPI_LINUX_MEMBARRIER_H
2 #define _UAPI_LINUX_MEMBARRIER_H
7 * membarrier system call API
9 * Copyright (c) 2010, 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * enum membarrier_cmd - membarrier system call command
32 * @MEMBARRIER_CMD_QUERY: Query the set of supported commands. It returns
33 * a bitmask of valid commands.
34 * @MEMBARRIER_CMD_SHARED: Execute a memory barrier on all running threads.
35 * Upon return from system call, the caller thread
36 * is ensured that all running threads have passed
37 * through a state where all memory accesses to
38 * user-space addresses match program order between
39 * entry to and return from the system call
40 * (non-running threads are de facto in such a
41 * state). This covers threads from all processes
42 * running on the system. This command returns 0.
44 * Command to be passed to the membarrier system call. The commands need to
45 * be a single bit each, except for MEMBARRIER_CMD_QUERY which is assigned to
49 MEMBARRIER_CMD_QUERY
= 0,
50 MEMBARRIER_CMD_SHARED
= (1 << 0),
53 #endif /* _UAPI_LINUX_MEMBARRIER_H */