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/*
* Copyright (c) 2021-Present, Redis Ltd.
* All rights reserved.
*
* Licensed under your choice of (a) the Redis Source Available License 2.0
* (RSALv2); or (b) the Server Side Public License v1 (SSPLv1); or (c) the
* GNU Affero General Public License v3 (AGPLv3).
*/
#pragma once
#include "fmacros.h"
#include <sys/types.h>
#include <unistd.h>
/** This is an API to invoke callback on a list of threads using a user defined signal handler.
* NOTE: This is API is only supported only in linux systems.
* Calling the functions below on any other system does nothing.
*/
#define THREADS_SIGNAL SIGUSR2
/* Callback signature */
typedef void(*run_on_thread_cb)(void);
/* Register the process to THREADS_SIGNAL */
void ThreadsManager_init(void);
/** @brief Invoke callback by each thread in tids.
*
* @param tids An array of threads that need to invoke callback.
* @param tids_len The number of threads in @param tids.
* @param callback A callback to be invoked by each thread in @param tids.
*
* NOTES:
* It is assumed that all the threads don't block or ignore THREADS_SIGNAL.
*
* It is safe to include the calling thread in @param tids. However, be aware that subsequent tids will
* not be signaled until the calling thread returns from the callback invocation.
* Hence, it is recommended to place the calling thread last in @param tids.
*
* The function returns only when @param tids_len threads have returned from @param callback, or when we reached timeout.
*
* @return 1 if successful, 0 If ThreadsManager_runOnThreads is already in the middle of execution.
*
**/
int ThreadsManager_runOnThreads(pid_t *tids, size_t tids_len, run_on_thread_cb callback);
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