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https://github.com/mpv-player/mpv
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36 lines
1.8 KiB
C
36 lines
1.8 KiB
C
#ifndef MPV_MP_THREAD_POOL_H
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#define MPV_MP_THREAD_POOL_H
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#include <stdbool.h>
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struct mp_thread_pool;
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// Create a thread pool with the given number of worker threads. This can return
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// NULL if the worker threads could not be created. The thread pool can be
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// destroyed with talloc_free(pool), or indirectly with talloc_free(ta_parent).
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// If there are still work items on freeing, it will block until all work items
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// are done, and the threads terminate.
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// init_threads is the number of threads created in this function (and it fails
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// if it could not be done). min_threads must be >=, if it's >, then the
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// remaining threads will be created on demand, but never destroyed.
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// If init_threads > 0, then mp_thread_pool_queue() can never fail.
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// If init_threads == 0, mp_thread_pool_create() itself can never fail.
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struct mp_thread_pool *mp_thread_pool_create(void *ta_parent, int init_threads,
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int min_threads, int max_threads);
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// Queue a function to be run on a worker thread: fn(fn_ctx)
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// If no worker thread is currently available, it's appended to a list in memory
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// with unbounded size. This function always returns immediately.
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// Concurrent queue calls are allowed, as long as it does not overlap with
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// pool destruction.
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// This function is explicitly thread-safe.
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// Cannot fail if thread pool was created with at least 1 thread.
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bool mp_thread_pool_queue(struct mp_thread_pool *pool, void (*fn)(void *ctx),
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void *fn_ctx);
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// Like mp_thread_pool_queue(), but only queue the item and succeed if a thread
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// can be reserved for the item (i.e. minimal wait time instead of unbounded).
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bool mp_thread_pool_run(struct mp_thread_pool *pool, void (*fn)(void *ctx),
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void *fn_ctx);
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#endif
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