// The current implementation will exit if the allocation
// of any worker fails. Still, return a boolean so that
// a future implementation can possibly do a partial
// initialization of the workers and report such to the
// caller.
bool WorkGang::initialize_workers() {
if (TraceWorkGang) {
tty->print_cr("Constructing work gang %s with %d threads",
name(),
total_workers());
}
_gang_workers = NEW_C_HEAP_ARRAY(GangWorker*, total_workers(), mtInternal);
if (gang_workers() == NULL) {
vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GangWorker array.");
return false;
}
os::ThreadType worker_type;
if (are_ConcurrentGC_threads()) {
worker_type = os::cgc_thread;
} else {
worker_type = os::pgc_thread;
}
for (uint worker = 0; worker < total_workers(); worker += 1) {
GangWorker* new_worker = allocate_worker(worker);
assert(new_worker != NULL, "Failed to allocate GangWorker");
_gang_workers[worker] = new_worker;
if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) {
vm_exit_out_of_memory(0, OOM_MALLOC_ERROR,
"Cannot create worker GC thread. Out of system resources.");
return false;
}
if (!DisableStartThread) {
os::start_thread(new_worker);
}
}
return true;
}
void AbstractWorkGang::add_workers(uint active_workers, bool initializing) {
os::ThreadType worker_type;
if (are_ConcurrentGC_threads()) {
worker_type = os::cgc_thread;
} else {
worker_type = os::pgc_thread;
}
uint previous_created_workers = _created_workers;
_created_workers = WorkerManager::add_workers(this,
active_workers,
_total_workers,
_created_workers,
worker_type,
initializing);
_active_workers = MIN2(_created_workers, _active_workers);
WorkerManager::log_worker_creation(this, previous_created_workers, _active_workers, _created_workers, initializing);
}
/**
* 创建并初始化所有的工作线程
*/
bool WorkGang::initialize_workers() {
if (TraceWorkGang) {
tty->print_cr("Constructing work gang %s with %d threads",
name(),
total_workers());
}
_gang_workers = NEW_C_HEAP_ARRAY(GangWorker*, total_workers());
if (gang_workers() == NULL) {
vm_exit_out_of_memory(0, "Cannot create GangWorker array.");
return false;
}
os::ThreadType worker_type;
if (are_ConcurrentGC_threads()) {
worker_type = os::cgc_thread;
} else {
worker_type = os::pgc_thread;
}
printf("%s[%d] [tid: %lu]: 开始创建 %u 个 %s Gc线程.\n", __FILE__, __LINE__, pthread_self(), total_workers(),
worker_type == os::cgc_thread? "Concurrent" : "Parallel");
for (uint worker = 0; worker < total_workers(); worker += 1) {
GangWorker* new_worker = allocate_worker(worker);
assert(new_worker != NULL, "Failed to allocate GangWorker");
_gang_workers[worker] = new_worker;
if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) {
vm_exit_out_of_memory(0, "Cannot create worker GC thread. Out of system resources.");
return false;
}
if (!DisableStartThread) {
os::start_thread(new_worker);
}
}
return true;
}
