70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
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#include "twn_util.h"
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#include "twn_workers_c.h"
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#include "rendering/twn_draw_c.h"
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SDL_sem *workers_job_semaphore;
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static SDL_Thread *workers_pool[MAX_WORKERS];
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static size_t workers_pool_size;
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static SDL_mutex *workers_mutex;
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static bool workers_should_exit;
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/* logic is such that when job is posted, worker threads attempt to grab it from any possible entry point */
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/* if it did something, which is signaled by `true` return, go back to waiting on semaphore, so that it's decremented properly */
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static int worker_thread(void *udata) {
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(void)udata;
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while (true) {
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/* check whether loop should end */
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SDL_LockMutex(workers_mutex);
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if (workers_should_exit) {
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SDL_UnlockMutex(workers_mutex);
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break;
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}
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SDL_UnlockMutex(workers_mutex);
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/* wait and occasionally go back to check whether it all should end */
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if (SDL_SemWaitTimeout(workers_job_semaphore, 100) == SDL_MUTEX_TIMEDOUT)
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continue;
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if (model_load_workers_thread())
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continue;
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}
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return 0;
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}
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/* TODO: have a path for platforms without thread support? */
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/* TODO: limit stack size? */
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bool workers_init(size_t worker_count) {
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SDL_assert(workers_pool_size == 0);
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if (worker_count > MAX_WORKERS)
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worker_count = MAX_WORKERS;
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/* spawn a bunch of detached threads without references to them */
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for (size_t i = 0; i < worker_count; ++i) {
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SDL_Thread *thread = SDL_CreateThread(worker_thread, "worker", NULL);
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SDL_assert_always(thread);
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SDL_DetachThread(thread);
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}
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workers_pool_size = worker_count;
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workers_job_semaphore = SDL_CreateSemaphore(0);
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workers_mutex = SDL_CreateMutex();
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return true;
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}
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void workers_deinit(void) {
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SDL_LockMutex(workers_mutex);
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workers_should_exit = true;
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SDL_UnlockMutex(workers_mutex);
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/* TODO: that's not correct */
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SDL_DestroyMutex(workers_mutex);
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SDL_DestroySemaphore(workers_job_semaphore);
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workers_pool_size = 0;
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}
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