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Diffstat (limited to 'util/lock/ipc_lock.h')
-rw-r--r-- | util/lock/ipc_lock.h | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/util/lock/ipc_lock.h b/util/lock/ipc_lock.h deleted file mode 100644 index 5d0d321af4..0000000000 --- a/util/lock/ipc_lock.h +++ /dev/null @@ -1,69 +0,0 @@ -/* Copyright 2012, Google Inc. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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. - * * Neither the name of Google Inc. nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "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 COPYRIGHT - * OWNER OR CONTRIBUTORS 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. - */ - -#ifndef __UTIL_IPC_LOCK_H -#define __UTIL_IPC_LOCK_H - -struct ipc_lock { - int is_held; /* internal */ - const char *filename; /* provided by the developer */ - int fd; /* internal */ -}; - -/* don't use C99 initializers here, so this can be used in C++ code */ -#define LOCKFILE_INIT(lockfile) \ - { \ - 0, /* is_held */ \ - lockfile, /* filename */ \ - -1, /* fd */ \ - } - -/* - * acquire_lock: acquire a lock - * - * timeout <0 = no timeout (try forever) - * timeout 0 = do not wait (return immediately) - * timeout >0 = wait up to $timeout milliseconds (subject to kernel scheduling) - * - * return 0 = lock acquired - * return >0 = lock was already held - * return <0 = failed to acquire lock - */ -extern int acquire_lock(struct ipc_lock *lock, int timeout_msecs); - -/* - * release_lock: release a lock - * - * returns 0 if lock was released successfully - * returns -1 if lock had not been held before the call - */ -extern int release_lock(struct ipc_lock *lock); - -#endif /* __UTIL_IPC_LOCK_H */ |