Rich Felker
de7e99c585
when manipulating the robust list, the order of stores matters, because the code may be asynchronously interrupted by a fatal signal and the kernel will then access the robust list in what is essentially an async-signal context. previously, aliasing considerations made it seem unlikely that a compiler could reorder the stores, but proving that they could not be reordered incorrectly would have been extremely difficult. instead I've opted to make all the pointers used as part of the robust list, including those in the robust list head and in the individual mutexes, volatile. in addition, the format of the robust list has been changed to point back to the head at the end, rather than ending with a null pointer. this is to match the documented kernel robust list ABI. the null pointer, which was previously used, only worked because faults during access terminate the robust list processing.
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
#ifndef _PTHREAD_IMPL_H
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#define _PTHREAD_IMPL_H
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#include <pthread.h>
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#include <signal.h>
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#include <errno.h>
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#include <limits.h>
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#include "libc.h"
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#include "syscall.h"
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#include "atomic.h"
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#include "futex.h"
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#define pthread __pthread
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struct pthread {
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struct pthread *self;
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void **dtv, *unused1, *unused2;
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uintptr_t sysinfo;
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uintptr_t canary;
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pid_t tid, pid;
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int tsd_used, errno_val;
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volatile int cancel, canceldisable, cancelasync;
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int detached;
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unsigned char *map_base;
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size_t map_size;
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void *stack;
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size_t stack_size;
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void *start_arg;
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void *(*start)(void *);
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void *result;
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struct __ptcb *cancelbuf;
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void **tsd;
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pthread_attr_t attr;
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volatile int dead;
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struct {
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volatile void *volatile head;
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long off;
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volatile void *volatile pending;
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} robust_list;
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int unblock_cancel;
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int timer_id;
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locale_t locale;
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int killlock[2];
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int exitlock[2];
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int startlock[2];
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unsigned long sigmask[_NSIG/8/sizeof(long)];
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};
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struct __timer {
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int timerid;
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pthread_t thread;
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};
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#define __SU (sizeof(size_t)/sizeof(int))
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#define _a_stacksize __u.__s[0]
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#define _a_guardsize __u.__s[1]
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#define _a_stackaddr __u.__s[2]
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#define _a_detach __u.__i[3*__SU+0]
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#define _a_sched __u.__i[3*__SU+1]
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#define _a_policy __u.__i[3*__SU+2]
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#define _a_prio __u.__i[3*__SU+3]
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#define _m_type __u.__i[0]
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#define _m_lock __u.__i[1]
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#define _m_waiters __u.__i[2]
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#define _m_prev __u.__p[3]
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#define _m_next __u.__p[4]
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#define _m_count __u.__i[5]
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#define _c_mutex __u.__p[0]
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#define _c_seq __u.__i[2]
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#define _c_waiters __u.__i[3]
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#define _c_clock __u.__i[4]
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#define _c_lock __u.__i[5]
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#define _c_lockwait __u.__i[6]
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#define _c_waiters2 __u.__i[7]
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#define _c_destroy __u.__i[8]
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#define _rw_lock __u.__i[0]
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#define _rw_waiters __u.__i[1]
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#define _rw_shared __u.__i[2]
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#define _b_lock __u.__i[0]
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#define _b_waiters __u.__i[1]
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#define _b_limit __u.__i[2]
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#define _b_count __u.__i[3]
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#define _b_waiters2 __u.__i[4]
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#define _b_inst __u.__p[3]
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#include "pthread_arch.h"
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#define SIGTIMER 32
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#define SIGCANCEL 33
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#define SIGSYNCCALL 34
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#define SIGALL_SET ((sigset_t *)(const unsigned long long [2]){ -1,-1 })
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#define SIGPT_SET \
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((sigset_t *)(const unsigned long [_NSIG/8/sizeof(long)]){ \
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[sizeof(long)==4] = 3UL<<(32*(sizeof(long)>4)) })
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#define SIGTIMER_SET \
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((sigset_t *)(const unsigned long [_NSIG/8/sizeof(long)]){ \
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0x80000000 })
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pthread_t __pthread_self_init(void);
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int __clone(int (*)(void *), void *, int, void *, ...);
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int __set_thread_area(void *);
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int __libc_sigaction(int, const struct sigaction *, struct sigaction *);
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int __libc_sigprocmask(int, const sigset_t *, sigset_t *);
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void __lock(volatile int *);
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void __unmapself(void *, size_t);
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int __timedwait(volatile int *, int, clockid_t, const struct timespec *, void (*)(void *), void *, int);
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void __wait(volatile int *, volatile int *, int, int);
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static inline void __wake(volatile void *addr, int cnt, int priv)
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{
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if (priv) priv = 128;
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if (cnt<0) cnt = INT_MAX;
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__syscall(SYS_futex, addr, FUTEX_WAKE|priv, cnt) != -EINVAL ||
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__syscall(SYS_futex, addr, FUTEX_WAKE, cnt);
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}
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void __acquire_ptc();
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void __release_ptc();
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void __inhibit_ptc();
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void __block_all_sigs(void *);
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void __block_app_sigs(void *);
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void __restore_sigs(void *);
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#define DEFAULT_STACK_SIZE 81920
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#define DEFAULT_GUARD_SIZE PAGE_SIZE
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#endif
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