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0e75c4a463
5476f8cd2e("htl: move pthread_self info libc.") moved the htl pthread_self() function from libpthread to libc, replacing the previous libc stub that just returns 0. And53da64d1cf("htl: Initialize ___pthread_self early") added initialization code which is needed before being able to call pthread_self. It is currently in libpthread, and thus never called before programs can call pthread_self from libc, which then segfaults when accessing _pthread_self()->thread. This moves the initialization to libc itself, as initialized variables, so pthread_self can always be called fine.
145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
/* System dependent pthreads code. Hurd version.
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Copyright (C) 2000-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <stddef.h>
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#include <stdint.h>
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#include <mach.h>
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#include <mach/mig_support.h>
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#include <pt-internal.h>
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#include <pthreadP.h>
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static void
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reset_pthread_total (void)
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{
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/* Only current thread remains */
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__pthread_total = 1;
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}
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/* This function is called from the Hurd-specific startup code. It
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should return a new stack pointer for the main thread. The caller
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will switch to this new stack before doing anything serious. */
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static void
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_init_routine (void *stack)
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{
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struct __pthread *thread;
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int err;
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pthread_attr_t attr, *attrp = 0;
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if (GL (dl_pthread_threads) != NULL)
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/* Already initialized */
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return;
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/* Initialize the library. */
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___pthread_init ();
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if (stack != NULL)
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{
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/* We are given a stack, use it. */
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/* Get the stack area information */
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vm_address_t addr = (vm_address_t) stack;
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vm_size_t vm_size;
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vm_prot_t prot, max_prot;
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vm_inherit_t inherit;
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boolean_t is_shared;
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memory_object_name_t obj;
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vm_offset_t offset;
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if (__vm_region (__mach_task_self (), &addr,
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&vm_size, &prot, &max_prot, &inherit, &is_shared,
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&obj, &offset) == KERN_SUCCESS)
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__mach_port_deallocate (__mach_task_self (), obj);
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else
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{
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/* Uh. Assume at least a page. */
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vm_size = __vm_page_size;
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#if _STACK_GROWS_DOWN
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addr = (vm_address_t) stack - vm_size;
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#else
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addr = (vm_address_t) stack + vm_size;
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#endif
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}
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/* Avoid allocating another stack */
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attrp = &attr;
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__pthread_attr_init (attrp);
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__pthread_attr_setstack (attrp, (void *) addr, vm_size);
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}
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/* Create the pthread structure for the main thread (i.e. us). */
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err = __pthread_create_internal (&thread, attrp, 0, 0);
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assert_perror (err);
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/* XXX The caller copies the command line arguments and the environment
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to the new stack. Pretend it wasn't allocated so that it remains
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valid if the main thread terminates. */
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thread->stack = 0;
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#if TLS_TCB_AT_TP
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thread->tcb = THREAD_SELF;
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#elif TLS_DTV_AT_TP
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/* Assuming THREAD_SELF is implemented as subtracting TLS_PRE_TCB_SIZE
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from the value of a thread pointer regsiter, this should optimize
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down to simply reading that register. */
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thread->tcb = (tcbhead_t *) (((char *) THREAD_SELF) + TLS_PRE_TCB_SIZE);
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#else
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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#endif
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#ifndef PAGESIZE
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__pthread_default_attr.__guardsize = __vm_page_size;
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#endif
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/* Copy over the thread-specific state */
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assert (!__pthread_init_thread.thread_specifics);
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memcpy (&thread->static_thread_specifics,
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&__pthread_init_thread.static_thread_specifics,
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sizeof (thread->static_thread_specifics));
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___pthread_self = thread;
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/* Decrease the number of threads, to take into account that the
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signal thread (which will be created by the glibc startup code
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when we return from here) shouldn't be seen as a user thread. */
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__pthread_total--;
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__pthread_atfork (NULL, NULL, reset_pthread_total);
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GL(dl_init_static_tls) = &__pthread_init_static_tls;
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/* Make MiG code thread aware. */
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__mig_init (thread->stackaddr);
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}
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void
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__pthread_initialize_minimal (void)
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{
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_init_routine (__libc_stack_end);
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}
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#ifdef SHARED
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__attribute__ ((constructor))
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static void
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dynamic_init_routine (void)
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{
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_init_routine (__libc_stack_end);
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}
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#endif
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