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https://github.com/n64dev/cen64.git
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49960312ce
Both Windows and Linux seem to be doing a terrible job of scheduling the device threads optimally. Until I can think of something more clever, manually set thread affinity.
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
//
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// os/posix/thread.h: Multi-threading functions and types.
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2015, Tyler J. Stachecki.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#ifndef CEN64_OS_POSIX_THREAD
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#define CEN64_OS_POSIX_THREAD
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#include "common.h"
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#include <pthread.h>
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#include <sched.h>
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#define CEN64_THREAD_RETURN_TYPE void*
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#define CEN64_THREAD_RETURN_VAL NULL
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// Type definitions.
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typedef pthread_t cen64_thread;
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typedef void* (*cen64_thread_func)(void *arg);
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typedef pthread_mutex_t cen64_mutex;
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typedef pthread_cond_t cen64_cv;
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//
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// Threads.
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//
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// Creates a thread and starts executing 'f' within the thread.
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static inline int cen64_thread_create(cen64_thread *t,
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cen64_thread_func f, void *arg) {
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return pthread_create(t, NULL, f, arg);
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}
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//
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// Returns a pointer to the currently executing thread.
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//
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static inline int cen64_thread_get_current(cen64_thread *t) {
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*t = pthread_self();
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return 0;
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}
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//
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// Join a thread created with cen64_thread_create. Use this to
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// effectively "free" the resources acquired for the thread.
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//
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static inline int cen64_thread_join(cen64_thread *t) {
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return pthread_join(*t, NULL);
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}
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//
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// Set the affinity of a thread to the CPU mask given by mask.
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// Assumes the host system has <= 32 CPUs, but good enough for now.
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//
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static inline int cen64_thread_setaffinity(cen64_thread *t, uint32_t mask) {
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cpu_set_t cpuset;
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unsigned i;
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CPU_ZERO(&cpuset);
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for (i = 0; mask; i++, mask >>= 1) {
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if (mask & 0x1)
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CPU_SET(i, &cpuset);
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}
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return pthread_setaffinity_np(*t, sizeof(cpuset), &cpuset);
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}
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//
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// Mutexes.
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//
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// Allocates resources for/initializes a mutex.
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static inline int cen64_mutex_create(cen64_mutex *m) {
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return pthread_mutex_init(m, NULL);
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}
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// Releases resources acquired by cen64_mutex_create.
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static inline int cen64_mutex_destroy(cen64_mutex *m) {
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return pthread_mutex_destroy(m);
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}
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// Locks the mutex passed as an argument.
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static inline int cen64_mutex_lock(cen64_mutex *m) {
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return pthread_mutex_lock(m);
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}
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// Unlocks the mutex passed as an argument.
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static inline int cen64_mutex_unlock(cen64_mutex *m) {
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return pthread_mutex_unlock(m);
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}
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//
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// Condition variables.
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//
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// Allocates resources for/initializes a CV.
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static inline int cen64_cv_create(cen64_cv *cv) {
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return pthread_cond_init(cv, NULL);
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}
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// Releases resources acquired by cen64_cv_create.
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static inline int cen64_cv_destroy(cen64_cv *cv) {
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return pthread_cond_destroy(cv);
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}
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// Releases the mutex and waits until cen64_cv_signal is called.
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static inline int cen64_cv_wait(cen64_cv *cv, cen64_mutex *m) {
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return pthread_cond_wait(cv, m);
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}
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// Signals the condition variable.
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static inline int cen64_cv_signal(cen64_cv *cv) {
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return pthread_cond_signal(cv);
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}
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#endif
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