516
517 void os::Linux::init_thread_fpu_state(void) {
518 // Disable FP exceptions.
519 __asm__ __volatile__ ("mtfsfi 6,0");
520 }
521
522 int os::Linux::get_fpu_control_word(void) {
523 // x86 has problems with FPU precision after pthread_cond_timedwait().
524 // nothing to do on ppc64.
525 return 0;
526 }
527
528 void os::Linux::set_fpu_control_word(int fpu_control) {
529 // x86 has problems with FPU precision after pthread_cond_timedwait().
530 // nothing to do on ppc64.
531 }
532
533 ////////////////////////////////////////////////////////////////////////////////
534 // thread stack
535
536 size_t os::Linux::min_stack_allowed = 128*K;
537
538 // return default stack size for thr_type
539 size_t os::Linux::default_stack_size(os::ThreadType thr_type) {
540 // default stack size (compiler thread needs larger stack)
541 // Notice that the setting for compiler threads here have no impact
542 // because of the strange 'fallback logic' in os::create_thread().
543 // Better set CompilerThreadStackSize in globals_<os_cpu>.hpp if you want to
544 // specify a different stack size for compiler threads!
545 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
546 return s;
547 }
548
549 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
550 return 2 * page_size();
551 }
552
553 // Java thread:
554 //
555 // Low memory addresses
556 // +------------------------+
557 // | |\ JavaThread created by VM does not have glibc
558 // | glibc guard page | - guard, attached Java thread usually has
559 // | |/ 1 page glibc guard.
560 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
561 // | |\
562 // | HotSpot Guard Pages | - red and yellow pages
563 // | |/
564 // +------------------------+ JavaThread::stack_yellow_zone_base()
|
516
517 void os::Linux::init_thread_fpu_state(void) {
518 // Disable FP exceptions.
519 __asm__ __volatile__ ("mtfsfi 6,0");
520 }
521
522 int os::Linux::get_fpu_control_word(void) {
523 // x86 has problems with FPU precision after pthread_cond_timedwait().
524 // nothing to do on ppc64.
525 return 0;
526 }
527
528 void os::Linux::set_fpu_control_word(int fpu_control) {
529 // x86 has problems with FPU precision after pthread_cond_timedwait().
530 // nothing to do on ppc64.
531 }
532
533 ////////////////////////////////////////////////////////////////////////////////
534 // thread stack
535
536 size_t os::Posix::_compiler_thread_min_stack_allowed = 128 * K;
537 size_t os::Posix::_java_thread_min_stack_allowed = 128 * K;
538 size_t os::Posix::_vm_internal_thread_min_stack_allowed = 128 * K;
539
540 // return default stack size for thr_type
541 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
542 // default stack size (compiler thread needs larger stack)
543 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1024 * K);
544 return s;
545 }
546
547 size_t os::Linux::default_guard_size(os::ThreadType thr_type) {
548 return 2 * page_size();
549 }
550
551 // Java thread:
552 //
553 // Low memory addresses
554 // +------------------------+
555 // | |\ JavaThread created by VM does not have glibc
556 // | glibc guard page | - guard, attached Java thread usually has
557 // | |/ 1 page glibc guard.
558 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size()
559 // | |\
560 // | HotSpot Guard Pages | - red and yellow pages
561 // | |/
562 // +------------------------+ JavaThread::stack_yellow_zone_base()
|