diff options
Diffstat (limited to 'lib/libthr/thread/thr_init.c')
| -rw-r--r-- | lib/libthr/thread/thr_init.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_init.c b/lib/libthr/thread/thr_init.c new file mode 100644 index 000000000000..0f9e3749d75f --- /dev/null +++ b/lib/libthr/thread/thr_init.c @@ -0,0 +1,544 @@ +/*- + * SPDX-License-Identifier: BSD-4-Clause + * + * Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org> + * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by John Birrell. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#define _WANT_P_OSREL +#include "namespace.h" +#include <sys/param.h> +#include <sys/auxv.h> +#include <sys/signalvar.h> +#include <sys/ioctl.h> +#include <sys/link_elf.h> +#include <sys/resource.h> +#include <sys/sysctl.h> +#include <sys/ttycom.h> +#include <sys/mman.h> +#include <sys/rtprio.h> +#include <errno.h> +#include <fcntl.h> +#include <paths.h> +#include <pthread.h> +#include <pthread_np.h> +#include <signal.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> +#include "un-namespace.h" + +#include "libc_private.h" +#include "thr_private.h" + +int __getosreldate(void); +char *_usrstack; +struct pthread *_thr_initial; +int _libthr_debug; +int _thread_event_mask; +struct pthread *_thread_last_event; +pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list); +pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list); +int _thread_active_threads = 1; +atfork_head _thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list); +struct urwlock _thr_atfork_lock = DEFAULT_URWLOCK; + +struct pthread_prio _thr_priorities[3] = { + {RTP_PRIO_MIN, RTP_PRIO_MAX, 0}, /* FIFO */ + {0, 0, 63}, /* OTHER */ + {RTP_PRIO_MIN, RTP_PRIO_MAX, 0} /* RR */ +}; + +struct pthread_attr _pthread_attr_default = { + .sched_policy = SCHED_OTHER, + .sched_inherit = PTHREAD_INHERIT_SCHED, + .prio = 0, + .suspend = THR_CREATE_RUNNING, + .flags = PTHREAD_SCOPE_SYSTEM, + .stackaddr_attr = NULL, + .stacksize_attr = THR_STACK_DEFAULT, + .guardsize_attr = 0, + .cpusetsize = 0, + .cpuset = NULL +}; + +struct pthread_mutex_attr _pthread_mutexattr_default = { + .m_type = PTHREAD_MUTEX_DEFAULT, + .m_protocol = PTHREAD_PRIO_NONE, + .m_ceiling = 0, + .m_pshared = PTHREAD_PROCESS_PRIVATE, + .m_robust = PTHREAD_MUTEX_STALLED, +}; + +struct pthread_mutex_attr _pthread_mutexattr_adaptive_default = { + .m_type = PTHREAD_MUTEX_ADAPTIVE_NP, + .m_protocol = PTHREAD_PRIO_NONE, + .m_ceiling = 0, + .m_pshared = PTHREAD_PROCESS_PRIVATE, + .m_robust = PTHREAD_MUTEX_STALLED, +}; + +/* Default condition variable attributes: */ +struct pthread_cond_attr _pthread_condattr_default = { + .c_pshared = PTHREAD_PROCESS_PRIVATE, + .c_clockid = CLOCK_REALTIME +}; + +int _thr_is_smp = 0; +size_t _thr_guard_default; +size_t _thr_stack_default = THR_STACK_DEFAULT; +size_t _thr_stack_initial = THR_STACK_INITIAL; +int _thr_page_size; +int _thr_spinloops; +int _thr_yieldloops; +int _thr_queuefifo = 4; +int _gc_count; +struct umutex _mutex_static_lock = DEFAULT_UMUTEX; +struct umutex _cond_static_lock = DEFAULT_UMUTEX; +struct umutex _rwlock_static_lock = DEFAULT_UMUTEX; +struct umutex _keytable_lock = DEFAULT_UMUTEX; +struct urwlock _thr_list_lock = DEFAULT_URWLOCK; +struct umutex _thr_event_lock = DEFAULT_UMUTEX; +struct umutex _suspend_all_lock = DEFAULT_UMUTEX; +struct pthread *_single_thread; +int _suspend_all_cycle; +int _suspend_all_waiters; + +int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *); +int __pthread_mutex_lock(pthread_mutex_t *); +int __pthread_mutex_trylock(pthread_mutex_t *); +void _thread_init_hack(void) __attribute__ ((constructor)); + +static void init_private(void); +static void init_main_thread(struct pthread *thread); + +/* + * All weak references used within libc should be in this table. + * This is so that static libraries will work. + */ + +STATIC_LIB_REQUIRE(_fork); +STATIC_LIB_REQUIRE(_pthread_getspecific); +STATIC_LIB_REQUIRE(_pthread_key_create); +STATIC_LIB_REQUIRE(_pthread_key_delete); +STATIC_LIB_REQUIRE(_pthread_mutex_destroy); +STATIC_LIB_REQUIRE(_pthread_mutex_init); +STATIC_LIB_REQUIRE(_pthread_mutex_lock); +STATIC_LIB_REQUIRE(_pthread_mutex_trylock); +STATIC_LIB_REQUIRE(_pthread_mutex_unlock); +STATIC_LIB_REQUIRE(_pthread_mutexattr_init); +STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy); +STATIC_LIB_REQUIRE(_pthread_mutexattr_settype); +STATIC_LIB_REQUIRE(_pthread_once); +STATIC_LIB_REQUIRE(_pthread_setspecific); +STATIC_LIB_REQUIRE(_raise); +STATIC_LIB_REQUIRE(_sem_destroy); +STATIC_LIB_REQUIRE(_sem_getvalue); +STATIC_LIB_REQUIRE(_sem_init); +STATIC_LIB_REQUIRE(_sem_post); +STATIC_LIB_REQUIRE(_sem_timedwait); +STATIC_LIB_REQUIRE(_sem_trywait); +STATIC_LIB_REQUIRE(_sem_wait); +STATIC_LIB_REQUIRE(_sigaction); +STATIC_LIB_REQUIRE(_sigprocmask); +STATIC_LIB_REQUIRE(_sigtimedwait); +STATIC_LIB_REQUIRE(_sigwait); +STATIC_LIB_REQUIRE(_sigwaitinfo); +STATIC_LIB_REQUIRE(_spinlock); +STATIC_LIB_REQUIRE(_spinunlock); +STATIC_LIB_REQUIRE(_thread_init_hack); + +/* + * These are needed when linking statically. All references within + * libgcc (and in the future libc) to these routines are weak, but + * if they are not (strongly) referenced by the application or other + * libraries, then the actual functions will not be loaded. + */ +STATIC_LIB_REQUIRE(_pthread_once); +STATIC_LIB_REQUIRE(_pthread_key_create); +STATIC_LIB_REQUIRE(_pthread_key_delete); +STATIC_LIB_REQUIRE(_pthread_getspecific); +STATIC_LIB_REQUIRE(_pthread_setspecific); +STATIC_LIB_REQUIRE(_pthread_mutex_init); +STATIC_LIB_REQUIRE(_pthread_mutex_destroy); +STATIC_LIB_REQUIRE(_pthread_mutex_lock); +STATIC_LIB_REQUIRE(_pthread_mutex_trylock); +STATIC_LIB_REQUIRE(_pthread_mutex_unlock); +STATIC_LIB_REQUIRE(_pthread_create); + +/* Pull in all symbols required by libthread_db */ +STATIC_LIB_REQUIRE(_thread_state_running); + +#define DUAL_ENTRY(entry) \ + (pthread_func_t)entry, (pthread_func_t)entry + +static pthread_func_t jmp_table[][2] = { + [PJT_ATFORK] = {DUAL_ENTRY(_thr_atfork)}, + [PJT_ATTR_DESTROY] = {DUAL_ENTRY(_thr_attr_destroy)}, + [PJT_ATTR_GETDETACHSTATE] = {DUAL_ENTRY(_thr_attr_getdetachstate)}, + [PJT_ATTR_GETGUARDSIZE] = {DUAL_ENTRY(_thr_attr_getguardsize)}, + [PJT_ATTR_GETINHERITSCHED] = {DUAL_ENTRY(_thr_attr_getinheritsched)}, + [PJT_ATTR_GETSCHEDPARAM] = {DUAL_ENTRY(_thr_attr_getschedparam)}, + [PJT_ATTR_GETSCHEDPOLICY] = {DUAL_ENTRY(_thr_attr_getschedpolicy)}, + [PJT_ATTR_GETSCOPE] = {DUAL_ENTRY(_thr_attr_getscope)}, + [PJT_ATTR_GETSTACKADDR] = {DUAL_ENTRY(_thr_attr_getstackaddr)}, + [PJT_ATTR_GETSTACKSIZE] = {DUAL_ENTRY(_thr_attr_getstacksize)}, + [PJT_ATTR_INIT] = {DUAL_ENTRY(_thr_attr_init)}, + [PJT_ATTR_SETDETACHSTATE] = {DUAL_ENTRY(_thr_attr_setdetachstate)}, + [PJT_ATTR_SETGUARDSIZE] = {DUAL_ENTRY(_thr_attr_setguardsize)}, + [PJT_ATTR_SETINHERITSCHED] = {DUAL_ENTRY(_thr_attr_setinheritsched)}, + [PJT_ATTR_SETSCHEDPARAM] = {DUAL_ENTRY(_thr_attr_setschedparam)}, + [PJT_ATTR_SETSCHEDPOLICY] = {DUAL_ENTRY(_thr_attr_setschedpolicy)}, + [PJT_ATTR_SETSCOPE] = {DUAL_ENTRY(_thr_attr_setscope)}, + [PJT_ATTR_SETSTACKADDR] = {DUAL_ENTRY(_thr_attr_setstackaddr)}, + [PJT_ATTR_SETSTACKSIZE] = {DUAL_ENTRY(_thr_attr_setstacksize)}, + [PJT_CANCEL] = {DUAL_ENTRY(_thr_cancel)}, + [PJT_CLEANUP_POP] = {DUAL_ENTRY(_thr_cleanup_pop)}, + [PJT_CLEANUP_PUSH] = {DUAL_ENTRY(_thr_cleanup_push)}, + [PJT_COND_BROADCAST] = {DUAL_ENTRY(_thr_cond_broadcast)}, + [PJT_COND_DESTROY] = {DUAL_ENTRY(_thr_cond_destroy)}, + [PJT_COND_INIT] = {DUAL_ENTRY(_thr_cond_init)}, + [PJT_COND_SIGNAL] = {DUAL_ENTRY(_thr_cond_signal)}, + [PJT_COND_TIMEDWAIT] = {DUAL_ENTRY(_thr_cond_timedwait)}, + [PJT_COND_WAIT] = {(pthread_func_t)__thr_cond_wait, + (pthread_func_t)_thr_cond_wait}, + [PJT_DETACH] = {DUAL_ENTRY(_thr_detach)}, + [PJT_EQUAL] = {DUAL_ENTRY(_thr_equal)}, + [PJT_EXIT] = {DUAL_ENTRY(_Tthr_exit)}, + [PJT_GETSPECIFIC] = {DUAL_ENTRY(_thr_getspecific)}, + [PJT_JOIN] = {DUAL_ENTRY(_thr_join)}, + [PJT_KEY_CREATE] = {DUAL_ENTRY(_thr_key_create)}, + [PJT_KEY_DELETE] = {DUAL_ENTRY(_thr_key_delete)}, + [PJT_KILL] = {DUAL_ENTRY(_Tthr_kill)}, + [PJT_MAIN_NP] = {DUAL_ENTRY(_thr_main_np)}, + [PJT_MUTEXATTR_DESTROY] = {DUAL_ENTRY(_thr_mutexattr_destroy)}, + [PJT_MUTEXATTR_INIT] = {DUAL_ENTRY(_thr_mutexattr_init)}, + [PJT_MUTEXATTR_SETTYPE] = {DUAL_ENTRY(_thr_mutexattr_settype)}, + [PJT_MUTEX_DESTROY] = {DUAL_ENTRY(_thr_mutex_destroy)}, + [PJT_MUTEX_INIT] = {DUAL_ENTRY(__Tthr_mutex_init)}, + [PJT_MUTEX_LOCK] = {DUAL_ENTRY(__Tthr_mutex_lock)}, + [PJT_MUTEX_TRYLOCK] = {DUAL_ENTRY(__Tthr_mutex_trylock)}, + [PJT_MUTEX_UNLOCK] = {DUAL_ENTRY(_thr_mutex_unlock)}, + [PJT_ONCE] = {DUAL_ENTRY(_thr_once)}, + [PJT_RWLOCK_DESTROY] = {DUAL_ENTRY(_thr_rwlock_destroy)}, + [PJT_RWLOCK_INIT] = {DUAL_ENTRY(_thr_rwlock_init)}, + [PJT_RWLOCK_RDLOCK] = {DUAL_ENTRY(_Tthr_rwlock_rdlock)}, + [PJT_RWLOCK_TRYRDLOCK] = {DUAL_ENTRY(_Tthr_rwlock_tryrdlock)}, + [PJT_RWLOCK_TRYWRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_trywrlock)}, + [PJT_RWLOCK_UNLOCK] = {DUAL_ENTRY(_Tthr_rwlock_unlock)}, + [PJT_RWLOCK_WRLOCK] = {DUAL_ENTRY(_Tthr_rwlock_wrlock)}, + [PJT_SELF] = {DUAL_ENTRY(_Tthr_self)}, + [PJT_SETCANCELSTATE] = {DUAL_ENTRY(_thr_setcancelstate)}, + [PJT_SETCANCELTYPE] = {DUAL_ENTRY(_thr_setcanceltype)}, + [PJT_SETSPECIFIC] = {DUAL_ENTRY(_thr_setspecific)}, + [PJT_SIGMASK] = {DUAL_ENTRY(_thr_sigmask)}, + [PJT_TESTCANCEL] = {DUAL_ENTRY(_Tthr_testcancel)}, + [PJT_CLEANUP_POP_IMP] = {DUAL_ENTRY(__thr_cleanup_pop_imp)}, + [PJT_CLEANUP_PUSH_IMP] = {DUAL_ENTRY(__thr_cleanup_push_imp)}, + [PJT_CANCEL_ENTER] = {DUAL_ENTRY(_Tthr_cancel_enter)}, + [PJT_CANCEL_LEAVE] = {DUAL_ENTRY(_Tthr_cancel_leave)}, + [PJT_MUTEX_CONSISTENT] = {DUAL_ENTRY(_Tthr_mutex_consistent)}, + [PJT_MUTEXATTR_GETROBUST] = {DUAL_ENTRY(_thr_mutexattr_getrobust)}, + [PJT_MUTEXATTR_SETROBUST] = {DUAL_ENTRY(_thr_mutexattr_setrobust)}, + [PJT_GETTHREADID_NP] = {DUAL_ENTRY(_thr_getthreadid_np)}, + [PJT_ATTR_GET_NP] = {DUAL_ENTRY(_thr_attr_get_np)}, + [PJT_GETNAME_NP] = {DUAL_ENTRY(_thr_getname_np)}, + [PJT_SUSPEND_ALL_NP] = {DUAL_ENTRY(_thr_suspend_all_np)}, + [PJT_RESUME_ALL_NP] = {DUAL_ENTRY(_thr_resume_all_np)}, +}; + +static int init_once = 0; + +/* + * For the shared version of the threads library, the above is sufficient. + * But for the archive version of the library, we need a little bit more. + * Namely, we must arrange for this particular module to be pulled in from + * the archive library at link time. To accomplish that, we define and + * initialize a variable, "_thread_autoinit_dummy_decl". This variable is + * referenced (as an extern) from libc/stdlib/exit.c. This will always + * create a need for this module, ensuring that it is present in the + * executable. + */ +extern int _thread_autoinit_dummy_decl; +int _thread_autoinit_dummy_decl = 0; + +void +_thread_init_hack(void) +{ + + _libpthread_init(NULL); +} + + +/* + * Threaded process initialization. + * + * This is only called under two conditions: + * + * 1) Some thread routines have detected that the library hasn't yet + * been initialized (_thr_initial == NULL && curthread == NULL), or + * + * 2) An explicit call to reinitialize after a fork (indicated + * by curthread != NULL) + */ +void +_libpthread_init(struct pthread *curthread) +{ + int first, dlopened; + + /* Check if this function has already been called: */ + if (_thr_initial != NULL && curthread == NULL) + /* Only initialize the threaded application once. */ + return; + + /* + * Check the size of the jump table to make sure it is preset + * with the correct number of entries. + */ + if (sizeof(jmp_table) != sizeof(pthread_func_t) * PJT_MAX * 2) + PANIC("Thread jump table not properly initialized"); + memcpy(__thr_jtable, jmp_table, sizeof(jmp_table)); + __thr_interpose_libc(); + + /* Initialize pthread private data. */ + init_private(); + + /* Set the initial thread. */ + if (curthread == NULL) { + first = 1; + /* Force _get_curthread() return NULL until set. */ + _tcb_get()->tcb_thread = NULL; + /* Create and initialize the initial thread. */ + curthread = _thr_alloc(NULL); + if (curthread == NULL) + PANIC("Can't allocate initial thread"); + init_main_thread(curthread); + } else { + first = 0; + } + + /* + * Add the thread to the thread list queue. + */ + THR_LIST_ADD(curthread); + _thread_active_threads = 1; + + /* Setup the thread specific data */ + __thr_setup_tsd(curthread); + + if (first) { + _thr_initial = curthread; + dlopened = _rtld_is_dlopened(&_thread_autoinit_dummy_decl) != 0; + _thr_signal_init(dlopened); + if (_thread_event_mask & TD_CREATE) + _thr_report_creation(curthread, curthread); + /* + * Always use our rtld lock implementation. + * It is faster because it postpones signal handlers + * instead of calling sigprocmask(2). + */ + _thr_rtld_init(); + } +} + +/* + * This function and pthread_create() do a lot of the same things. + * It'd be nice to consolidate the common stuff in one place. + */ +static void +init_main_thread(struct pthread *thread) +{ + struct sched_param sched_param; + int i; + + /* Setup the thread attributes. */ + thr_self(&thread->tid); + thread->attr = _pthread_attr_default; + /* + * Set up the thread stack. + * + * Create a red zone below the main stack. All other stacks + * are constrained to a maximum size by the parameters + * passed to mmap(), but this stack is only limited by + * resource limits, so this stack needs an explicitly mapped + * red zone to protect the thread stack that is just beyond. + */ + if (mmap(_usrstack - _thr_stack_initial - + _thr_guard_default, _thr_guard_default, 0, MAP_ANON, + -1, 0) == MAP_FAILED) + PANIC("Cannot allocate red zone for initial thread"); + + /* + * Mark the stack as an application supplied stack so that it + * isn't deallocated. + * + * XXX - I'm not sure it would hurt anything to deallocate + * the main thread stack because deallocation doesn't + * actually free() it; it just puts it in the free + * stack queue for later reuse. + */ + thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial; + thread->attr.stacksize_attr = _thr_stack_initial; + thread->attr.guardsize_attr = _thr_guard_default; + thread->attr.flags |= THR_STACK_USER; + + /* + * Write a magic value to the thread structure + * to help identify valid ones: + */ + thread->magic = THR_MAGIC; + + thread->cancel_enable = 1; + thread->cancel_async = 0; + + /* Initialize the mutex queues */ + for (i = 0; i < TMQ_NITEMS; i++) + TAILQ_INIT(&thread->mq[i]); + + thread->state = PS_RUNNING; + + _thr_getscheduler(thread->tid, &thread->attr.sched_policy, + &sched_param); + thread->attr.prio = sched_param.sched_priority; + +#ifdef _PTHREAD_FORCED_UNWIND + thread->unwind_stackend = _usrstack; +#endif + + thread->uexterr.ver = UEXTERROR_VER; + if (__getosreldate() >= P_OSREL_EXTERRCTL) + exterrctl(EXTERRCTL_ENABLE, EXTERRCTLF_FORCE, &thread->uexterr); + + /* Others cleared to zero by thr_alloc() */ +} + +bool +__thr_get_main_stack_base(char **base) +{ + size_t len; + int mib[2]; + + if (elf_aux_info(AT_USRSTACKBASE, base, sizeof(*base)) == 0) + return (true); + + mib[0] = CTL_KERN; + mib[1] = KERN_USRSTACK; + len = sizeof(*base); + if (sysctl(mib, nitems(mib), base, &len, NULL, 0) == 0) + return (true); + + return (false); +} + +bool +__thr_get_main_stack_lim(size_t *lim) +{ + struct rlimit rlim; + + if (elf_aux_info(AT_USRSTACKLIM, lim, sizeof(*lim)) == 0) + return (true); + + if (getrlimit(RLIMIT_STACK, &rlim) == 0) { + *lim = rlim.rlim_cur; + return (true); + } + + return (false); +} + +static void +init_private(void) +{ + char *env, *env_bigstack, *env_splitstack; + + _thr_umutex_init(&_mutex_static_lock); + _thr_umutex_init(&_cond_static_lock); + _thr_umutex_init(&_rwlock_static_lock); + _thr_umutex_init(&_keytable_lock); + _thr_urwlock_init(&_thr_atfork_lock); + _thr_umutex_init(&_thr_event_lock); + _thr_umutex_init(&_suspend_all_lock); + _thr_spinlock_init(); + _thr_list_init(); + _thr_wake_addr_init(); + _sleepq_init(); + _single_thread = NULL; + _suspend_all_waiters = 0; + + /* + * Avoid reinitializing some things if they don't need to be, + * e.g. after a fork(). + */ + if (init_once == 0) { + __thr_pshared_init(); + __thr_malloc_init(); + + /* Find the stack top */ + if (!__thr_get_main_stack_base(&_usrstack)) + PANIC("Cannot get kern.usrstack"); + env_bigstack = getenv("LIBPTHREAD_BIGSTACK_MAIN"); + env_splitstack = getenv("LIBPTHREAD_SPLITSTACK_MAIN"); + if (env_bigstack != NULL || env_splitstack == NULL) { + if (!__thr_get_main_stack_lim(&_thr_stack_initial)) + PANIC("Cannot get stack rlimit"); + } + _thr_is_smp = sysconf(_SC_NPROCESSORS_CONF); + if (_thr_is_smp == -1) + PANIC("Cannot get _SC_NPROCESSORS_CONF"); + _thr_is_smp = (_thr_is_smp > 1); + _thr_page_size = getpagesize(); + _thr_guard_default = _thr_page_size; + _pthread_attr_default.guardsize_attr = _thr_guard_default; + _pthread_attr_default.stacksize_attr = _thr_stack_default; + env = getenv("LIBPTHREAD_SPINLOOPS"); + if (env) + _thr_spinloops = atoi(env); + env = getenv("LIBPTHREAD_YIELDLOOPS"); + if (env) + _thr_yieldloops = atoi(env); + env = getenv("LIBPTHREAD_QUEUE_FIFO"); + if (env) + _thr_queuefifo = atoi(env); + env = getenv("LIBPTHREAD_UMTX_MIN_TIMEOUT"); + if (env) { + char *endptr; + long mint; + + mint = strtol(env, &endptr, 0); + if (*endptr == '\0' && mint >= 0) { + _umtx_op(NULL, UMTX_OP_SET_MIN_TIMEOUT, + mint, NULL, NULL); + } + } + } + init_once = 1; +} |