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re PR libgcj/7587 (direct threaded interpreter not thread-safe)

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2004-07-13  Bryce McKinlay  <mckinlay@redhat.com>

	PR libgcj/7587
	* interpret.cc (compile_mutex): New.
	(_Jv_InitInterpreter): New. Initialize compile_mutex.
	(run): Lock compile_mutex before calling compile() if compilation is
	required.
	* prims.cc (_Jv_CreateJavaVM): Call _Jv_InitInterpreter().
	* include/java-interp.h (_Jv_InitInterpreter): Declare.

From-SVN: r84644
This commit is contained in:
Bryce McKinlay
2004-07-13 21:03:03 +00:00
committed by Bryce McKinlay
parent b6fa4f6e16
commit 6187fd28ad
4 changed files with 38 additions and 2 deletions
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24
libjava/interpret.cc
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@@ -54,6 +54,21 @@ static void throw_null_pointer_exception ()
__attribute__ ((__noreturn__));
#endif
#ifdef DIRECT_THREADED
// Lock to ensure that methods are not compiled concurrently.
// We could use a finer-grained lock here, however it is not safe to use
// the Class monitor as user code in another thread could hold it.
static _Jv_Mutex_t compile_mutex;
void
_Jv_InitInterpreter()
{
_Jv_MutexInit (&compile_mutex);
}
#else
void _Jv_InitInterpreter() {}
#endif
extern "C" double __ieee754_fmod (double,double);
// This represents a single slot in the "compiled" form of the
@@ -1032,9 +1047,14 @@ _Jv_InterpMethod::run (void *retp, ffi_raw *args)
#define PCVAL(unionval) unionval.p
#define AMPAMP(label) &&label
// Compile if we must.
// Compile if we must. NOTE: Double-check locking.
if (prepared == NULL)
compile (insn_target);
{
_Jv_MutexLock (&compile_mutex);
if (prepared == NULL)
compile (insn_target);
_Jv_MutexUnlock (&compile_mutex);
}
pc = (insn_slot *) prepared;
#else