diff options
Diffstat (limited to 'nptl/sysdeps/x86_64/tls.h')
| -rw-r--r-- | nptl/sysdeps/x86_64/tls.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/nptl/sysdeps/x86_64/tls.h b/nptl/sysdeps/x86_64/tls.h index 0b5aeb00ff..4a614c02af 100644 --- a/nptl/sysdeps/x86_64/tls.h +++ b/nptl/sysdeps/x86_64/tls.h @@ -47,6 +47,7 @@ typedef struct dtv_t *dtv; void *self; /* Pointer to the thread descriptor. */ int multiple_threads; + int gscope_flag; uintptr_t sysinfo; uintptr_t stack_guard; uintptr_t pointer_guard; @@ -337,6 +338,26 @@ typedef struct = THREAD_GETMEM (THREAD_SELF, header.pointer_guard)) +/* Get and set the global scope generation counter in the TCB head. */ +#define THREAD_GSCOPE_FLAG_UNUSED 0 +#define THREAD_GSCOPE_FLAG_USED 1 +#define THREAD_GSCOPE_FLAG_WAIT 2 +#define THREAD_GSCOPE_RESET_FLAG() \ + do \ + { int __res; \ + asm volatile ("xchgl %0, %%fs:%P1" \ + : "=r" (__res) \ + : "i" (offsetof (struct pthread, header.gscope_flag)), \ + "0" (THREAD_GSCOPE_FLAG_UNUSED)); \ + if (__res == THREAD_GSCOPE_FLAG_WAIT) \ + lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1); \ + } \ + while (0) +#define THREAD_GSCOPE_SET_FLAG() \ + THREAD_SETMEM (THREAD_SELF, header.gscope_flag, THREAD_GSCOPE_FLAG_USED) +#define THREAD_GSCOPE_WAIT() \ + GL(dl_wait_lookup_done) () + #endif /* __ASSEMBLER__ */ #endif /* tls.h */ |