diff options
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 7fe2222c68..4f2e8180d3 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; \ |