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6896043: first round of zero fixes

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Reviewed-by: kvn
This commit is contained in:
Gary Benson 2009-11-27 07:56:58 -08:00 • committed by Christian Thalinger
parent 4a2266601a
commit 63cc2211ed
10 changed files with 59 additions and 54 deletions
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15
hotspot/src/share/vm/prims/jni.cpp
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@ -3231,6 +3231,21 @@ _JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, v
jint result = JNI_ERR;
DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);
// We're about to use Atomic::xchg for synchronization. Some Zero
// platforms use the GCC builtin __sync_lock_test_and_set for this,
// but __sync_lock_test_and_set is not guaranteed to do what we want
// on all architectures. So we check it works before relying on it.
#if defined(ZERO) && defined(ASSERT)
{
jint a = 0xcafebabe;
jint b = Atomic::xchg(0xdeadbeef, &a);
void *c = &a;
void *d = Atomic::xchg_ptr(&b, &c);
assert(a == 0xdeadbeef && b == (jint) 0xcafebabe, "Atomic::xchg() works");
assert(c == &b && d == &a, "Atomic::xchg_ptr() works");
}
#endif // ZERO && ASSERT
// At the moment it's only possible to have one Java VM,
// since some of the runtime state is in global variables.