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2f69522d46
Install signal handlers and unblock signals before pthread_create creates the first thread. create_thread in sysdeps/unix/sysv/linux/createthread.c can send SIGCANCEL to the current thread, so the SIGCANCEL handler is currently needed even if pthread_cancel is never called. (The way timer_create uses SIGCANCEL does not need a signal handler; both SIG_DFL and SIG_IGN dispositions should work.) Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/resource.h>
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#include <pthreadP.h>
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#include <atomic.h>
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#include <ldsodefs.h>
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#include <tls.h>
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#include <list.h>
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#include <version.h>
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#include <shlib-compat.h>
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#include <lowlevellock.h>
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#include <futex-internal.h>
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#include <kernel-features.h>
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#include <libc-pointer-arith.h>
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#include <pthread_mutex_conf.h>
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/* Size and alignment of static TLS block. */
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size_t __static_tls_size;
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size_t __static_tls_align_m1;
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/* Version of the library, used in libthread_db to detect mismatches. */
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static const char nptl_version[] __attribute_used__ = VERSION;
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void
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__pthread_initialize_minimal_internal (void)
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{
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/* Get the size of the static and alignment requirements for the TLS
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block. */
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size_t static_tls_align;
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_dl_get_tls_static_info (&__static_tls_size, &static_tls_align);
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/* Make sure the size takes all the alignments into account. */
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if (STACK_ALIGN > static_tls_align)
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static_tls_align = STACK_ALIGN;
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__static_tls_align_m1 = static_tls_align - 1;
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__static_tls_size = roundup (__static_tls_size, static_tls_align);
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/* Determine the default allowed stack size. This is the size used
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in case the user does not specify one. */
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struct rlimit limit;
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if (__getrlimit (RLIMIT_STACK, &limit) != 0
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|| limit.rlim_cur == RLIM_INFINITY)
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/* The system limit is not usable. Use an architecture-specific
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default. */
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limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE;
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else if (limit.rlim_cur < PTHREAD_STACK_MIN)
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/* The system limit is unusably small.
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Use the minimal size acceptable. */
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limit.rlim_cur = PTHREAD_STACK_MIN;
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/* Make sure it meets the minimum size that allocate_stack
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(allocatestack.c) will demand, which depends on the page size. */
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const uintptr_t pagesz = GLRO(dl_pagesize);
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const size_t minstack = pagesz + __static_tls_size + MINIMAL_REST_STACK;
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if (limit.rlim_cur < minstack)
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limit.rlim_cur = minstack;
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/* Round the resource limit up to page size. */
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limit.rlim_cur = ALIGN_UP (limit.rlim_cur, pagesz);
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lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
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__default_pthread_attr.internal.stacksize = limit.rlim_cur;
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__default_pthread_attr.internal.guardsize = GLRO (dl_pagesize);
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lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
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}
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strong_alias (__pthread_initialize_minimal_internal,
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__pthread_initialize_minimal)
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/* This function is internal (it has a GLIBC_PRIVATE) version, but it
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is widely used (either via weak symbol, or dlsym) to obtain the
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__static_tls_size value. This value is then used to adjust the
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value of the stack size attribute, so that applications receive the
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full requested stack size, not diminished by the TCB and static TLS
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allocation on the stack. Once the TCB is separately allocated,
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this function should be removed or renamed (if it is still
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necessary at that point). */
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size_t
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__pthread_get_minstack (const pthread_attr_t *attr)
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{
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return GLRO(dl_pagesize) + __static_tls_size + PTHREAD_STACK_MIN;
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}
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