diff options
Diffstat (limited to 'libpthread')
| -rw-r--r-- | libpthread/linuxthreads/manager.c | 100 |
1 files changed, 88 insertions, 12 deletions
diff --git a/libpthread/linuxthreads/manager.c b/libpthread/linuxthreads/manager.c index 78d5336d5..a00c9b13e 100644 --- a/libpthread/linuxthreads/manager.c +++ b/libpthread/linuxthreads/manager.c @@ -14,9 +14,12 @@ /* The "thread manager" thread: manages creation and termination of threads */ -/* mods for uClibc: getpwd and getpagesize are the syscalls */ +/* mods for uClibc */ #define __getpid getpid #define __getpagesize getpagesize +#define __sched_get_priority_max sched_get_priority_max +#define __sched_getscheduler sched_getscheduler +#define __sched_getparam sched_getparam #include <features.h> #define __USE_GNU @@ -81,8 +84,13 @@ volatile pthread_descr __pthread_last_event; static inline pthread_descr thread_segment(int seg) { +# ifdef _STACK_GROWS_UP + return (pthread_descr)(THREAD_STACK_START_ADDRESS + (seg - 1) * STACK_SIZE) + + 1; +# else return (pthread_descr)(THREAD_STACK_START_ADDRESS - (seg - 1) * STACK_SIZE) - 1; +# endif } /* Flag set in signal handler to record child termination */ @@ -149,7 +157,7 @@ __pthread_manager(void *arg) sigdelset(&manager_mask, __pthread_sig_cancel); /* for thread termination */ sigdelset(&manager_mask, SIGTRAP); /* for debugging purposes */ if (__pthread_threads_debug && __pthread_sig_debug > 0) - sigdelset(&manager_mask, __pthread_sig_debug); + sigdelset(&manager_mask, __pthread_sig_debug); sigprocmask(SIG_SETMASK, &manager_mask, NULL); /* Raise our priority to match that of main thread */ __pthread_manager_adjust_prio(__pthread_main_thread->p_priority); @@ -245,10 +253,12 @@ __pthread_manager(void *arg) PDEBUG("got REQ_DEBUG\n"); /* Make gdb aware of new thread and gdb will restart the new thread when it is ready to handle the new thread. */ - if (__pthread_threads_debug && __pthread_sig_debug > 0) { - PDEBUG("about to call raise(__pthread_sig_debug)\n"); + if (__pthread_threads_debug && __pthread_sig_debug > 0) + { + PDEBUG("about to call raise(__pthread_sig_debug)\n"); raise(__pthread_sig_debug); } + break; case REQ_KICK: /* This is just a prod to get the manager to reap some threads right away, avoiding a potential delay at shutdown. */ @@ -279,6 +289,7 @@ int __pthread_manager_event(void *arg) } /* Process creation */ + static int __attribute__ ((noreturn)) pthread_start_thread(void *arg) @@ -286,10 +297,17 @@ pthread_start_thread(void *arg) pthread_descr self = (pthread_descr) arg; struct pthread_request request; void * outcome; +#if HP_TIMING_AVAIL + hp_timing_t tmpclock; +#endif /* Initialize special thread_self processing, if any. */ #ifdef INIT_THREAD_SELF INIT_THREAD_SELF(self, self->p_nr); #endif +#if HP_TIMING_AVAIL + HP_TIMING_NOW (tmpclock); + THREAD_SETMEM (self, p_cpuclock_offset, tmpclock); +#endif PDEBUG("\n"); /* Make sure our pid field is initialized, just in case we get there before our father has initialized it. */ @@ -363,12 +381,39 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, if (attr != NULL && attr->__stackaddr_set) { +#ifdef _STACK_GROWS_UP /* The user provided a stack. */ +# ifdef USE_TLS + /* This value is not needed. */ + new_thread = (pthread_descr) attr->__stackaddr; + new_thread_bottom = (char *) new_thread; +# else + new_thread = (pthread_descr) attr->__stackaddr; + new_thread_bottom = (char *) (new_thread + 1); +# endif + guardaddr = attr->__stackaddr + attr->__stacksize; + guardsize = 0; +#else + /* The user provided a stack. For now we interpret the supplied + address as 1 + the highest addr. in the stack segment. If a + separate register stack is needed, we place it at the low end + of the segment, relying on the associated stacksize to + determine the low end of the segment. This differs from many + (but not all) other pthreads implementations. The intent is + that on machines with a single stack growing toward higher + addresses, stackaddr would be the lowest address in the stack + segment, so that it is consistently close to the initial sp + value. */ +# ifdef USE_TLS + new_thread = (pthread_descr) attr->__stackaddr; +# else new_thread = (pthread_descr) ((long)(attr->__stackaddr) & -sizeof(void *)) - 1; +# endif new_thread_bottom = (char *) attr->__stackaddr - attr->__stacksize; guardaddr = NULL; guardsize = 0; +#endif __pthread_nonstandard_stacks = 1; } else @@ -493,7 +538,7 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, /* First check whether we have to change the policy and if yes, whether we can do this. Normally this should be done by examining the - return value of the sched_setscheduler call in pthread_start_thread + return value of the __sched_setscheduler call in pthread_start_thread but this is hard to implement. FIXME */ if (attr != NULL && attr->__schedpolicy != SCHED_OTHER && geteuid () != 0) return EPERM; @@ -546,8 +591,8 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, sizeof (struct sched_param)); break; case PTHREAD_INHERIT_SCHED: - new_thread->p_start_args.schedpolicy = sched_getscheduler(father_pid); - sched_getparam(father_pid, &new_thread->p_start_args.schedparam); + new_thread->p_start_args.schedpolicy = __sched_getscheduler(father_pid); + __sched_getparam(father_pid, &new_thread->p_start_args.schedparam); break; } new_thread->p_priority = @@ -588,17 +633,36 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, __pthread_lock(new_thread->p_lock, NULL); /* We have to report this event. */ +#ifdef NEED_SEPARATE_REGISTER_STACK + /* Perhaps this version should be used on all platforms. But + this requires that __clone2 be uniformly supported + everywhere. + + And there is some argument for changing the __clone2 + interface to pass sp and bsp instead, making it more IA64 + specific, but allowing stacks to grow outward from each + other, to get less paging and fewer mmaps. */ + pid = __clone2(pthread_start_thread_event, + (void **)new_thread_bottom, + (char *)stack_addr - new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | + __pthread_sig_cancel, new_thread); +#elif _STACK_GROWS_UP + pid = __clone(pthread_start_thread_event, (void *) new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | + __pthread_sig_cancel, new_thread); +#else pid = clone(pthread_start_thread_event, (void **) new_thread, CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); - +#endif saved_errno = errno; if (pid != -1) { /* Now fill in the information about the new thread in - the newly created thread's data structure. We cannot let - the new thread do this since we don't know whether it was - already scheduled when we send the event. */ + the newly created thread's data structure. We cannot let + the new thread do this since we don't know whether it was + already scheduled when we send the event. */ new_thread->p_eventbuf.eventdata = new_thread; new_thread->p_eventbuf.eventnum = TD_CREATE; __pthread_last_event = new_thread; @@ -619,9 +683,21 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, if (pid == 0) { PDEBUG("cloning new_thread = %p\n", new_thread); +#ifdef NEED_SEPARATE_REGISTER_STACK + pid = __clone2(pthread_start_thread, + (void **)new_thread_bottom, + (char *)stack_addr - new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | + __pthread_sig_cancel, new_thread); +#elif _STACK_GROWS_UP + pid = __clone(pthread_start_thread, (void *) new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | + __pthread_sig_cancel, new_thread); +#else pid = clone(pthread_start_thread, (void **) new_thread, CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); +#endif /* !NEED_SEPARATE_REGISTER_STACK */ saved_errno = errno; } /* Check if cloning succeeded */ @@ -922,7 +998,7 @@ void __pthread_manager_adjust_prio(int thread_prio) if (thread_prio <= __pthread_manager_thread.p_priority) return; param.sched_priority = - thread_prio < sched_get_priority_max(SCHED_FIFO) + thread_prio < __sched_get_priority_max(SCHED_FIFO) ? thread_prio + 1 : thread_prio; sched_setscheduler(__pthread_manager_thread.p_pid, SCHED_FIFO, ¶m); __pthread_manager_thread.p_priority = thread_prio; |