myth_thread_t myth_default_steal_func(int rank)
{
myth_running_env_t env,busy_env;
myth_thread_t next_run=NULL;
#ifdef MYTH_WS_PROF_DETAIL
uint64_t t0,t1;
t0=myth_get_rdtsc();
#endif
//Choose a worker thread that seems to be busy
env=&g_envs[rank];
busy_env=myth_env_get_first_busy(env);
if (busy_env){
//int ws_victim;
#if 0
#ifdef MYTH_SCHED_LOOP_DEBUG
myth_dprintf("env %p is trying to steal thread from %p...\n",env,busy_env);
#endif
#endif
//ws_victim=busy_env->rank;
//Try to steal thread
next_run=myth_queue_take(&busy_env->runnable_q);
if (next_run){
#ifdef MYTH_SCHED_LOOP_DEBUG
myth_dprintf("env %p is stealing thread %p from %p...\n",env,steal_th,busy_env);
#endif
myth_assert(next_run->status==MYTH_STATUS_READY);
//Change worker thread descriptor
}
}
#ifdef MYTH_WS_PROF_DETAIL
t1=myth_get_rdtsc();
if (g_sched_prof){
env->prof_data.ws_attempt_count[busy_env->rank]++;
if (next_run){
env->prof_data.ws_hit_cycles+=t1-t0;
env->prof_data.ws_hit_cnt++;
}else{
env->prof_data.ws_miss_cycles+=t1-t0;
env->prof_data.ws_miss_cnt++;
}
}
#endif
return next_run;
}
myth_thread_t myth_eco_steal(int rank) {
myth_running_env_t env,busy_env;
myth_thread_t next_run=NULL;
#ifdef MYTH_WS_PROF_DETAIL
uint64_t t0,t1;
t0=myth_get_rdtsc();
#endif
//Choose a worker thread that seems to be busy
env=&g_envs[rank];
if(env->isSleepy == 1) {
env->isSleepy = 0;
busy_env = &g_envs[env->ws_target];
} else {
busy_env=myth_env_get_first_busy(env);
}
if (busy_env){
myth_assert(busy_env!=env);
//int ws_victim;
//ws_victim=busy_env->rank;
//Try to steal thread
next_run=myth_queue_take(&busy_env->runnable_q);
if (next_run){
#ifdef MYTH_SCHED_LOOP_DEBUG
myth_dprintf("env %p is stealing thread %p from %p...\n",env,steal_th,busy_env);
#endif
myth_assert(next_run->status==MYTH_STATUS_READY);
//Change worker thread descriptor
next_run->env=env;
}
}
if(!next_run) {
if(busy_env->c == STEALING) {
#ifdef MYTH_ECO_TEST
if(env->thief_count < 3) {
env->thief_count++;
return 0;
}
#endif
myth_sleep();
// This line seems not correct, it may occur infinite recursion
//return myth_eco_steal(env->rank);
return NULL;
}
else if(busy_env->c == SLEEPING) {
MAY_BE_UNUSED int tmp = task_num;
next_run = myth_eco_all_task_check(env);
if(!next_run){
myth_sleep();
} else {
return next_run;
}
}
else if(busy_env->c == RUNNING) { // victim has one task and executing
int tmp = task_num;
next_run = myth_eco_all_task_check(env);
if(!next_run){
myth_sleep_2(tmp);
} else {
return next_run;
}
} else if(busy_env->c == FINISH) {
return (myth_thread_t)FINISH;
}
}
#ifdef MYTH_WS_PROF_DETAIL
t1=myth_get_rdtsc();
if (g_sched_prof){
env->prof_data.ws_attempt_count[busy_env->rank]++;
if (next_run){
env->prof_data.ws_hit_cycles+=t1-t0;
env->prof_data.ws_hit_cnt++;
}else{
env->prof_data.ws_miss_cycles+=t1-t0;
env->prof_data.ws_miss_cnt++;
}
}
#endif
#ifdef MYTH_ECO_TEST
env->thief_count = 0;
#endif
return next_run;
}