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comparison src/os_cpu/windows_x86/vm/os_windows_x86.cpp @ 671:d0994e5bebce

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6822204: volatile fences should prefer lock:addl to actual mfence instructions Reviewed-by: kvn, phh
author never
date Thu, 26 Mar 2009 14:31:45 -0700
parents 9ee9cf798b59
children bd02caa94611
comparison
equal deleted inserted replaced
668:90a66aa50514 671:d0994e5bebce
194 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*); 194 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*);
195 typedef jint cmpxchg_func_t (jint, volatile jint*, jint); 195 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
196 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong); 196 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong);
197 typedef jint add_func_t (jint, volatile jint*); 197 typedef jint add_func_t (jint, volatile jint*);
198 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*); 198 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*);
199 typedef void fence_func_t ();
200 199
201 #ifdef AMD64 200 #ifdef AMD64
202 201
203 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) { 202 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
204 // try to use the stub: 203 // try to use the stub:
289 } 288 }
290 assert(Threads::number_of_threads() == 0, "for bootstrap only"); 289 assert(Threads::number_of_threads() == 0, "for bootstrap only");
291 290
292 return (*dest) += add_value; 291 return (*dest) += add_value;
293 } 292 }
294
295 void os::fence_bootstrap() {
296 // try to use the stub:
297 fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
298
299 if (func != NULL) {
300 os::fence_func = func;
301 (*func)();
302 return;
303 }
304 assert(Threads::number_of_threads() == 0, "for bootstrap only");
305
306 // don't have to do anything for a single thread
307 }
308
309 293
310 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap; 294 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
311 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap; 295 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap;
312 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; 296 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
313 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap; 297 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
314 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap; 298 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap;
315 fence_func_t* os::fence_func = os::fence_bootstrap;
316 299
317 #endif // AMD64 300 #endif // AMD64
318 301
319 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; 302 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
320 303