c41dd77a3e
I have validated that these settings closely match the existing coding
style with one major exception on `BreakBeforeBraces`, which will be
`Attach` going forward. The mixed `BreakBeforeBraces` styles in the
current codebase are hard to imitate and also very odd IMHO - see below
```
if (a == 1) { /*Attach */
}
```
```
if (a == 1 ||
b == 2)
{ /* Why? */
}
```
Please do NOT merge just yet. Will add the github action next once the
style is reviewed/approved.
---------
Signed-off-by: Ping Xie <pingxie@google.com>
70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
/*
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* Copyright (c) 2021, Redis Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "fmacros.h"
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#include <sys/types.h>
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#include <unistd.h>
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/** This is an API to invoke callback on a list of threads using a user defined signal handler.
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* NOTE: This is API is only supported only in linux systems.
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* Calling the functions below on any other system does nothing.
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*/
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#define THREADS_SIGNAL SIGUSR2
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/* Callback signature */
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typedef void (*run_on_thread_cb)(void);
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/* Register the process to THREADS_SIGNAL */
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void ThreadsManager_init(void);
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/** @brief Invoke callback by each thread in tids.
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*
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* @param tids An array of threads that need to invoke callback.
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* @param tids_len The number of threads in @param tids.
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* @param callback A callback to be invoked by each thread in @param tids.
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*
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* NOTES:
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* It is assumed that all the threads don't block or ignore THREADS_SIGNAL.
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*
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* It is safe to include the calling thread in @param tids. However, be aware that subsequent tids will
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* not be signaled until the calling thread returns from the callback invocation.
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* Hence, it is recommended to place the calling thread last in @param tids.
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*
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* The function returns only when @param tids_len threads have returned from @param callback, or when we reached timeout.
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*
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* @return 1 if successful, 0 If ThreadsManager_runOnThreads is already in the middle of execution.
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*
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**/
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int ThreadsManager_runOnThreads(pid_t *tids, size_t tids_len, run_on_thread_cb callback);
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