DirectThread *
direct_thread_create( DirectThreadType thread_type,
DirectThreadMainFunc thread_main,
void *arg,
const char *name )
{
DirectThread *thread;
pthread_attr_t attr;
struct sched_param param;
int policy;
int priority;
size_t stack_size;
D_ASSERT( thread_main != NULL );
D_ASSERT( name != NULL );
D_DEBUG_AT( Direct_Thread, "%s( %s, %p(%p), '%s' )\n", __FUNCTION__,
direct_thread_type_name(thread_type), thread_main, arg, name );
/* Create the key for the TSD (thread specific data). */
pthread_mutex_lock( &key_lock );
if (thread_key == -1)
pthread_key_create( &thread_key, NULL );
pthread_mutex_unlock( &key_lock );
/* Allocate thread structure. */
thread = D_CALLOC( 1, sizeof(DirectThread) );
if (!thread) {
D_OOM();
return NULL;
}
/* Write thread information to structure. */
thread->name = D_STRDUP( name );
thread->type = thread_type;
thread->main = thread_main;
thread->arg = arg;
/* Initialize to -1 for synchronization. */
thread->thread = (pthread_t) -1;
thread->tid = (pid_t) -1;
/* Initialize mutex and condition. */
direct_util_recursive_pthread_mutex_init( &thread->lock );
pthread_cond_init( &thread->cond, NULL );
D_MAGIC_SET( thread, DirectThread );
/* Initialize scheduling and other parameters. */
pthread_attr_init( &attr );
pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
/* Select scheduler. */
switch (direct_config->thread_scheduler) {
case DCTS_FIFO:
policy = SCHED_FIFO;
break;
case DCTS_RR:
policy = SCHED_RR;
break;
default:
policy = SCHED_OTHER;
break;
}
if (pthread_attr_setschedpolicy( &attr, policy ))
D_PERROR( "Direct/Thread: Could not set scheduling policy to %s!\n", direct_thread_policy_name(policy) );
/* Read (back) value. */
pthread_attr_getschedpolicy( &attr, &policy );
/* Select priority. */
switch (thread->type) {
case DTT_CLEANUP:
case DTT_INPUT:
case DTT_OUTPUT:
case DTT_MESSAGING:
case DTT_CRITICAL:
priority = thread->type * direct_config->thread_priority_scale / 100;
break;
default:
priority = direct_config->thread_priority;
break;
}
D_DEBUG_AT( Direct_ThreadInit, " -> %s (%d) [%d;%d]\n", direct_thread_policy_name(policy), priority,
sched_get_priority_min( policy ), sched_get_priority_max( policy ) );
if (priority < sched_get_priority_min( policy ))
priority = sched_get_priority_min( policy );
if (priority > sched_get_priority_max( policy ))
priority = sched_get_priority_max( policy );
param.sched_priority = priority;
if (pthread_attr_setschedparam( &attr, ¶m ))
D_PERROR( "Direct/Thread: Could not set scheduling priority to %d!\n", priority );
/* Select stack size? */
if (direct_config->thread_stack_size > 0) {
if (pthread_attr_setstacksize( &attr, direct_config->thread_stack_size ))
D_PERROR( "Direct/Thread: Could not set stack size to %d!\n", direct_config->thread_stack_size );
}
/* Read (back) value. */
pthread_attr_getstacksize( &attr, &stack_size );
/* Lock the thread mutex. */
D_DEBUG_AT( Direct_ThreadInit, " -> locking...\n" );
pthread_mutex_lock( &thread->lock );
/* Create and run the thread. */
D_DEBUG_AT( Direct_ThreadInit, " -> creating...\n" );
pthread_create( &thread->thread, &attr, direct_thread_main, thread );
pthread_attr_destroy( &attr );
pthread_getschedparam( thread->thread, &policy, ¶m );
D_INFO( "Direct/Thread: Started '%s' (%d) [%s %s/%s %d/%d] <%zu>...\n",
name, thread->tid, direct_thread_type_name(thread_type),
direct_thread_policy_name(policy), direct_thread_scheduler_name(direct_config->thread_scheduler),
param.sched_priority, priority, stack_size );
#ifdef DIRECT_THREAD_WAIT_INIT
/* Wait for completion of the thread's initialization. */
while (!thread->init) {
D_DEBUG_AT( Direct_ThreadInit, " -> waiting...\n" );
pthread_cond_wait( &thread->cond, &thread->lock );
}
D_DEBUG_AT( Direct_ThreadInit, " -> ...thread is running.\n" );
#endif
/* Unlock the thread mutex. */
D_DEBUG_AT( Direct_ThreadInit, " -> unlocking...\n" );
pthread_mutex_unlock( &thread->lock );
D_DEBUG_AT( Direct_ThreadInit, " -> returning %p\n", thread );
return thread;
}
DirectResult
direct_thread_init( DirectThread *thread )
{
pthread_attr_t attr;
struct sched_param param;
int policy;
int priority;
size_t stack_size;
direct_once( &thread_init_once, init_once );
/* Initialize scheduling and other parameters. */
pthread_attr_init( &attr );
pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
/* Select scheduler. */
switch (direct_config->thread_scheduler) {
case DCTS_FIFO:
policy = SCHED_FIFO;
break;
case DCTS_RR:
policy = SCHED_RR;
break;
default:
policy = SCHED_OTHER;
break;
}
if (pthread_attr_setschedpolicy( &attr, policy ))
D_PERROR( "Direct/Thread: Could not set scheduling policy to %s!\n", direct_thread_policy_name(policy) );
/* Read (back) value. */
pthread_attr_getschedpolicy( &attr, &policy );
/* Select priority. */
switch (thread->type) {
case DTT_CLEANUP:
case DTT_INPUT:
case DTT_OUTPUT:
case DTT_MESSAGING:
case DTT_CRITICAL:
priority = thread->type * direct_config->thread_priority_scale / 100;
break;
default:
priority = direct_config->thread_priority;
break;
}
D_DEBUG_AT( Direct_ThreadInit, " -> %s (%d)\n", direct_thread_policy_name(policy), priority );
param.sched_priority = priority;
if (pthread_attr_setschedparam( &attr, ¶m ))
D_PERROR( "Direct/Thread: Could not set scheduling priority to %d!\n", priority );
/* Select stack size? */
if (direct_config->thread_stack_size > 0) {
if (pthread_attr_setstacksize( &attr, direct_config->thread_stack_size ))
D_PERROR( "Direct/Thread: Could not set stack size to %d!\n", direct_config->thread_stack_size );
}
/* Read (back) value. */
pthread_attr_getstacksize( &attr, &stack_size );
if (pthread_create( &thread->handle.thread, &attr, direct_thread_main, thread ))
return errno2result( errno );
D_INFO( "Direct/Thread: Started '%s' (%d) [%s %s/%s %d/%d] <%zu>...\n",
thread->name, thread->tid, direct_thread_type_name(thread->type),
direct_thread_policy_name(policy), direct_thread_scheduler_name(direct_config->thread_scheduler),
param.sched_priority, priority, stack_size );
pthread_attr_destroy( &attr );
pthread_getschedparam( thread->handle.thread, &policy, ¶m );
return DR_OK;
}