1 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <sys/param.h>
26 #include <sys/resource.h>
33 #include <shlib-compat.h>
37 #ifndef __NR_set_tid_address
38 /* XXX For the time being... Once we can rely on the kernel headers
39 having the definition remove these lines. */
41 # define __NR_set_tid_address 252
42 #elif defined __ia64__
43 # define __NR_set_tid_address 1233
44 #elif defined __i386__
45 # define __NR_set_tid_address 258
46 #elif defined __x86_64__
47 # define __NR_set_tid_address 218
48 #elif defined __powerpc__
49 # define __NR_set_tid_address 232
50 #elif defined __sparc__
51 # define __NR_set_tid_address 166
53 # error "define __NR_set_tid_address"
58 /* Default stack size. */
59 size_t __default_stacksize attribute_hidden
;
61 /* Size and alignment of static TLS block. */
62 size_t __static_tls_size
;
63 size_t __static_tls_align_m1
;
65 /* Flag whether the machine is SMP or not. */
66 int __is_smp attribute_hidden
;
68 /* Version of the library, used in libthread_db to detect mismatches. */
69 static const char nptl_version
[] __attribute_used__
= VERSION
;
72 #if defined USE_TLS && !defined SHARED
73 extern void __libc_setup_tls (size_t tcbsize
, size_t tcbalign
);
78 static const struct pthread_functions pthread_functions
=
80 .ptr_pthread_attr_destroy
= __pthread_attr_destroy
,
81 # if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
82 .ptr___pthread_attr_init_2_0
= __pthread_attr_init_2_0
,
84 .ptr___pthread_attr_init_2_1
= __pthread_attr_init_2_1
,
85 .ptr_pthread_attr_getdetachstate
= __pthread_attr_getdetachstate
,
86 .ptr_pthread_attr_setdetachstate
= __pthread_attr_setdetachstate
,
87 .ptr_pthread_attr_getinheritsched
= __pthread_attr_getinheritsched
,
88 .ptr_pthread_attr_setinheritsched
= __pthread_attr_setinheritsched
,
89 .ptr_pthread_attr_getschedparam
= __pthread_attr_getschedparam
,
90 .ptr_pthread_attr_setschedparam
= __pthread_attr_setschedparam
,
91 .ptr_pthread_attr_getschedpolicy
= __pthread_attr_getschedpolicy
,
92 .ptr_pthread_attr_setschedpolicy
= __pthread_attr_setschedpolicy
,
93 .ptr_pthread_attr_getscope
= __pthread_attr_getscope
,
94 .ptr_pthread_attr_setscope
= __pthread_attr_setscope
,
95 .ptr_pthread_condattr_destroy
= __pthread_condattr_destroy
,
96 .ptr_pthread_condattr_init
= __pthread_condattr_init
,
97 .ptr___pthread_cond_broadcast
= __pthread_cond_broadcast
,
98 .ptr___pthread_cond_destroy
= __pthread_cond_destroy
,
99 .ptr___pthread_cond_init
= __pthread_cond_init
,
100 .ptr___pthread_cond_signal
= __pthread_cond_signal
,
101 .ptr___pthread_cond_wait
= __pthread_cond_wait
,
102 .ptr___pthread_cond_timedwait
= __pthread_cond_timedwait
,
103 # if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)
104 .ptr___pthread_cond_broadcast_2_0
= __pthread_cond_broadcast_2_0
,
105 .ptr___pthread_cond_destroy_2_0
= __pthread_cond_destroy_2_0
,
106 .ptr___pthread_cond_init_2_0
= __pthread_cond_init_2_0
,
107 .ptr___pthread_cond_signal_2_0
= __pthread_cond_signal_2_0
,
108 .ptr___pthread_cond_wait_2_0
= __pthread_cond_wait_2_0
,
109 .ptr___pthread_cond_timedwait_2_0
= __pthread_cond_timedwait_2_0
,
111 .ptr_pthread_equal
= __pthread_equal
,
112 .ptr___pthread_exit
= __pthread_exit
,
113 .ptr_pthread_getschedparam
= __pthread_getschedparam
,
114 .ptr_pthread_setschedparam
= __pthread_setschedparam
,
115 .ptr_pthread_mutex_destroy
= INTUSE(__pthread_mutex_destroy
),
116 .ptr_pthread_mutex_init
= INTUSE(__pthread_mutex_init
),
117 .ptr_pthread_mutex_lock
= INTUSE(__pthread_mutex_lock
),
118 .ptr_pthread_mutex_unlock
= INTUSE(__pthread_mutex_unlock
),
119 .ptr_pthread_self
= __pthread_self
,
120 .ptr_pthread_setcancelstate
= __pthread_setcancelstate
,
121 .ptr_pthread_setcanceltype
= __pthread_setcanceltype
,
122 .ptr___pthread_cleanup_upto
= __pthread_cleanup_upto
,
123 .ptr___pthread_once
= __pthread_once_internal
,
124 .ptr___pthread_rwlock_rdlock
= __pthread_rwlock_rdlock_internal
,
125 .ptr___pthread_rwlock_wrlock
= __pthread_rwlock_wrlock_internal
,
126 .ptr___pthread_rwlock_unlock
= __pthread_rwlock_unlock_internal
,
127 .ptr___pthread_key_create
= __pthread_key_create_internal
,
128 .ptr___pthread_getspecific
= __pthread_getspecific_internal
,
129 .ptr___pthread_setspecific
= __pthread_setspecific_internal
,
130 .ptr__pthread_cleanup_push_defer
= __pthread_cleanup_push_defer
,
131 .ptr__pthread_cleanup_pop_restore
= __pthread_cleanup_pop_restore
,
132 .ptr_nthreads
= &__nptl_nthreads
,
133 .ptr___pthread_unwind
= &__pthread_unwind
,
134 .ptr__nptl_deallocate_tsd
= __nptl_deallocate_tsd
136 # define ptr_pthread_functions &pthread_functions
138 # define ptr_pthread_functions NULL
142 /* For asynchronous cancellation we use a signal. This is the handler. */
144 sigcancel_handler (int sig
, siginfo_t
*si
, void *ctx
)
146 /* Safety check. It would be possible to call this function for
147 other signals and send a signal from another thread. This is not
148 correct and might even be a security problem. Try to catch as
149 many incorrect invocations as possible. */
151 #ifdef __ASSUME_CORRECT_SI_PID
152 /* Kernels before 2.5.75 stored the thread ID and not the process
153 ID in si_pid so we skip this test. */
154 || si
->si_pid
!= THREAD_GETMEM (THREAD_SELF
, pid
)
156 || si
->si_code
!= SI_TKILL
)
159 struct pthread
*self
= THREAD_SELF
;
161 int oldval
= THREAD_GETMEM (self
, cancelhandling
);
164 /* We are canceled now. When canceled by another thread this flag
165 is already set but if the signal is directly send (internally or
166 from another process) is has to be done here. */
167 int newval
= oldval
| CANCELING_BITMASK
| CANCELED_BITMASK
;
169 if (oldval
== newval
|| (oldval
& EXITING_BITMASK
) != 0)
170 /* Already canceled or exiting. */
173 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
, newval
,
175 if (curval
== oldval
)
177 /* Set the return value. */
178 THREAD_SETMEM (self
, result
, PTHREAD_CANCELED
);
180 /* Make sure asynchronous cancellation is still enabled. */
181 if ((newval
& CANCELTYPE_BITMASK
) != 0)
182 /* Run the registered destructors and terminate the thread. */
193 /* When using __thread for this, we do it in libc so as not
194 to give libpthread its own TLS segment just for this. */
195 extern void **__libc_dl_error_tsd (void) __attribute__ ((const));
199 __pthread_initialize_minimal_internal (void)
202 /* Unlike in the dynamically linked case the dynamic linker has not
203 taken care of initializing the TLS data structures. */
204 __libc_setup_tls (TLS_TCB_SIZE
, TLS_TCB_ALIGN
);
206 /* We must prevent gcc from being clever and move any of the
207 following code ahead of the __libc_setup_tls call. This function
208 will initialize the thread register which is subsequently
210 __asm
__volatile ("");
213 /* Minimal initialization of the thread descriptor. */
214 struct pthread
*pd
= THREAD_SELF
;
215 INTERNAL_SYSCALL_DECL (err
);
216 pd
->pid
= pd
->tid
= INTERNAL_SYSCALL (set_tid_address
, err
, 1, &pd
->tid
);
217 THREAD_SETMEM (pd
, specific
[0], &pd
->specific_1stblock
[0]);
218 THREAD_SETMEM (pd
, user_stack
, true);
219 if (LLL_LOCK_INITIALIZER
!= 0)
220 THREAD_SETMEM (pd
, lock
, LLL_LOCK_INITIALIZER
);
222 THREAD_SETMEM (pd
, cpuclock_offset
, GL(dl_cpuclock_offset
));
225 /* Set initial thread's stack block from 0 up to __libc_stack_end.
226 It will be bigger than it actually is, but for unwind.c/pt-longjmp.c
227 purposes this is good enough. */
228 THREAD_SETMEM (pd
, stackblock_size
, (size_t) __libc_stack_end
);
230 /* Initialize the list of all running threads with the main thread. */
231 INIT_LIST_HEAD (&__stack_user
);
232 list_add (&pd
->list
, &__stack_user
);
235 /* Install the cancellation signal handler. If for some reason we
236 cannot install the handler we do not abort. Maybe we should, but
237 it is only asynchronous cancellation which is affected. */
239 sa
.sa_sigaction
= sigcancel_handler
;
240 sa
.sa_flags
= SA_SIGINFO
;
241 sigemptyset (&sa
.sa_mask
);
243 (void) __libc_sigaction (SIGCANCEL
, &sa
, NULL
);
245 /* The parent process might have left the signal blocked. Just in
246 case, unblock it. We reuse the signal mask in the sigaction
247 structure. It is already cleared. */
248 __sigaddset (&sa
.sa_mask
, SIGCANCEL
);
249 (void) INTERNAL_SYSCALL (rt_sigprocmask
, err
, 4, SIG_UNBLOCK
, &sa
.sa_mask
,
253 /* Determine the default allowed stack size. This is the size used
254 in case the user does not specify one. */
256 if (getrlimit (RLIMIT_STACK
, &limit
) != 0
257 || limit
.rlim_cur
== RLIM_INFINITY
)
258 /* The system limit is not usable. Use an architecture-specific
260 __default_stacksize
= ARCH_STACK_DEFAULT_SIZE
;
261 else if (limit
.rlim_cur
< PTHREAD_STACK_MIN
)
262 /* The system limit is unusably small.
263 Use the minimal size acceptable. */
264 __default_stacksize
= PTHREAD_STACK_MIN
;
267 /* Round the resource limit up to page size. */
268 const uintptr_t pagesz
= __sysconf (_SC_PAGESIZE
);
269 __default_stacksize
= (limit
.rlim_cur
+ pagesz
- 1) & -pagesz
;
272 /* Get the size of the static and alignment requirements for the TLS
274 size_t static_tls_align
;
275 _dl_get_tls_static_info (&__static_tls_size
, &static_tls_align
);
277 /* Make sure the size takes all the alignments into account. */
278 if (STACK_ALIGN
> static_tls_align
)
279 static_tls_align
= STACK_ALIGN
;
280 __static_tls_align_m1
= static_tls_align
- 1;
282 __static_tls_size
= roundup (__static_tls_size
, static_tls_align
);
285 /* Transfer the old value from the dynamic linker's internal location. */
286 *__libc_dl_error_tsd () = *(*GL(dl_error_catch_tsd
)) ();
287 GL(dl_error_catch_tsd
) = &__libc_dl_error_tsd
;
289 /* Make __rtld_lock_{,un}lock_recursive use pthread_mutex_{,un}lock,
290 keep the lock count from the ld.so implementation. */
291 GL(dl_rtld_lock_recursive
) = (void *) INTUSE (__pthread_mutex_lock
);
292 GL(dl_rtld_unlock_recursive
) = (void *) INTUSE (__pthread_mutex_unlock
);
293 unsigned int rtld_lock_count
= GL(dl_load_lock
).mutex
.__data
.__count
;
294 GL(dl_load_lock
).mutex
.__data
.__count
= 0;
295 while (rtld_lock_count
-- > 0)
296 INTUSE (__pthread_mutex_lock
) (&GL(dl_load_lock
).mutex
);
298 GL(dl_make_stack_executable_hook
) = &__make_stacks_executable
;
301 GL(dl_init_static_tls
) = &__pthread_init_static_tls
;
303 /* Register the fork generation counter with the libc. */
304 #ifndef TLS_MULTIPLE_THREADS_IN_TCB
305 __libc_multiple_threads_ptr
=
307 __libc_pthread_init (&__fork_generation
, __reclaim_stacks
,
308 ptr_pthread_functions
);
310 /* Determine whether the machine is SMP or not. */
311 __is_smp
= is_smp_system ();
313 strong_alias (__pthread_initialize_minimal_internal
,
314 __pthread_initialize_minimal
)