diff options
Diffstat (limited to 'libpthread/linuxthreads/pthread.c')
| -rw-r--r-- | libpthread/linuxthreads/pthread.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/pthread.c b/libpthread/linuxthreads/pthread.c index 5b038acb8..ad75b950d 100644 --- a/libpthread/linuxthreads/pthread.c +++ b/libpthread/linuxthreads/pthread.c @@ -214,6 +214,9 @@ char *__pthread_manager_thread_tos = NULL; int __pthread_exit_requested = 0; int __pthread_exit_code = 0; +/* Maximum stack size. */ +size_t __pthread_max_stacksize; + /* Communicate relevant LinuxThreads constants to gdb */ const int __pthread_threads_max = PTHREAD_THREADS_MAX; @@ -314,6 +317,50 @@ void __pthread_initialize_minimal(void) } +void +__pthread_init_max_stacksize(void) +{ + struct rlimit limit; + size_t max_stack; + + getrlimit(RLIMIT_STACK, &limit); +#ifdef FLOATING_STACKS + if (limit.rlim_cur == RLIM_INFINITY) + limit.rlim_cur = ARCH_STACK_MAX_SIZE; +# ifdef NEED_SEPARATE_REGISTER_STACK + max_stack = limit.rlim_cur / 2; +# else + max_stack = limit.rlim_cur; +# endif +#else + /* Play with the stack size limit to make sure that no stack ever grows + beyond STACK_SIZE minus one page (to act as a guard page). */ +# ifdef NEED_SEPARATE_REGISTER_STACK + /* STACK_SIZE bytes hold both the main stack and register backing + store. The rlimit value applies to each individually. */ + max_stack = STACK_SIZE/2 - __getpagesize (); +# else + max_stack = STACK_SIZE - __getpagesize(); +# endif + if (limit.rlim_cur > max_stack) { + limit.rlim_cur = max_stack; + setrlimit(RLIMIT_STACK, &limit); + } +#endif + __pthread_max_stacksize = max_stack; +#define __MAX_ALLOCA_CUTOFF 65536 + if (max_stack / 4 < __MAX_ALLOCA_CUTOFF) + { +#ifdef USE_TLS + pthread_descr self = THREAD_SELF; + self->p_alloca_cutoff = max_stack / 4; +#else + __pthread_initial_thread.p_alloca_cutoff = max_stack / 4; +#endif + } +} + + static void pthread_initialize(void) { struct sigaction sa; |