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| author | Ulrich Drepper <drepper@redhat.com> | 2003-04-05 05:21:15 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2003-04-05 05:21:15 +0000 |
| commit | b22d701bb72b928526efff83c019b912f469af72 (patch) | |
| tree | 4474c99dbe6f90a380c378817307646f6f8eff5c /nptl/sysdeps/i386/tls.h | |
| parent | 3242201746d74bfbccb8267f8b2e81a9478bf78b (diff) | |
| download | glibc-b22d701bb72b928526efff83c019b912f469af72.zip glibc-b22d701bb72b928526efff83c019b912f469af72.tar.gz glibc-b22d701bb72b928526efff83c019b912f469af72.tar.bz2 | |
Update.
2003-04-04 Ulrich Drepper <drepper@redhat.com>
* sysdeps/pthread/createthread.c (create_thread): Add some more
comments explaining when to set multiple_threads and when not.
* pthreadP.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
THREAD_ATOMIC_BIT_SET if not already defined.
* sysdeps/i386/tls.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
THREAD_ATOMIC_BIT_SET:
* sysdeps/x86_64/tls.h: Likewise.
* cleanup_defer.c (_pthread_cleanup_push_defer): Rewrite to use
THREAD_ATOMIC_CMPXCHG_VAL.
(_pthread_cleanup_pop_restore): Likewise.
* cancellation.c (__pthread_enable_asynccancel): Likewise.
(__pthread_enable_asynccancel_2): Likewise.
(__pthread_disable_asynccancel): Likewise.
* libc-cancellation.c (__libc_enable_asynccancel): Likewise.
(__libc_disable_asynccancel): Likewise.
* init.c (sigcancel_handler): Likewise.
* pthread_setcancelstate.c (__pthread_setcancelstate): Likewise.
* pthread_setcanceltype.c (__pthread_setcanceltype): Likewise.
Diffstat (limited to 'nptl/sysdeps/i386/tls.h')
| -rw-r--r-- | nptl/sysdeps/i386/tls.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/nptl/sysdeps/i386/tls.h b/nptl/sysdeps/i386/tls.h index 7fe2222..4f2e818 100644 --- a/nptl/sysdeps/i386/tls.h +++ b/nptl/sysdeps/i386/tls.h @@ -169,6 +169,14 @@ union user_desc_init # define INIT_SYSINFO #endif +#ifndef LOCK +# ifdef UP +# define LOCK /* nothing */ +# else +# define LOCK "lock;" +# endif +#endif + /* Code to initially initialize the thread pointer. This might need special attention since 'errno' is not yet available and if the operation can cause a failure 'errno' must not be touched. */ @@ -352,6 +360,32 @@ union user_desc_init }}) +/* Atomic compare and exchange on TLS, returning old value. */ +#define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, newval, oldval) \ + ({ __typeof (descr->member) __ret; \ + __typeof (oldval) __old = (oldval); \ + if (sizeof (descr->member) == 4) \ + asm volatile (LOCK "cmpxchgl %2, %%gs:%P3" \ + : "=a" (__ret) \ + : "0" (__old), "r" (newval), \ + "i" (offsetof (struct pthread, member))); \ + else \ + /* Not necessary for other sizes in the moment. */ \ + abort (); \ + __ret; }) + + +/* Atomic set bit. */ +#define THREAD_ATOMIC_BIT_SET(descr, member, bit) \ + (void) ({ if (sizeof ((descr)->member) == 4) \ + asm volatile (LOCK "orl %1, %%gs:%P0" \ + :: "i" (offsetof (struct pthread, member)), \ + "ir" (1 << (bit))); \ + else \ + /* Not necessary for other sizes in the moment. */ \ + abort (); }) + + /* Call the user-provided thread function. */ #define CALL_THREAD_FCT(descr) \ ({ void *__res; \ |