bug 722348 - eliminate JSRuntime::requestCount. r=luke

ipc/testshell/XPCShellEnvironment.cpp

@@ -1061,6 +1061,7 @@ XPCShellEnvironment::~XPCShellEnvironment()
 
         JSRuntime* rt = gOldContextCallback ? JS_GetRuntime(mCx) : NULL;
 
+        JS_EndRequest(mCx);
         JS_DestroyContext(mCx);
 
         if (gOldContextCallback) {

js/src/jsapi.cpp

@@ -765,7 +765,6 @@ JSRuntime::JSRuntime()
     data(NULL),
 #ifdef JS_THREADSAFE
     gcLock(NULL),
-    requestCount(0),
     gcHelperThread(thisFromCtor()),
 #endif
     debuggerMutations(0),
@@ -1013,10 +1012,9 @@ StartRequest(JSContext *cx)
         AutoLockGC lock(rt);
 
         /* Indicate that a request is running. */
-        rt->requestCount++;
         rt->requestDepth = 1;
 
-        if (rt->requestCount == 1 && rt->activityCallback)
+        if (rt->activityCallback)
             rt->activityCallback(rt->activityCallbackArg, true);
     }
 }
@@ -1037,13 +1035,8 @@ StopRequest(JSContext *cx)
 
         rt->requestDepth = 0;
 
-        /* Give the GC a chance to run if this was the last request running. */
-        JS_ASSERT(rt->requestCount > 0);
-        rt->requestCount--;
-        if (rt->requestCount == 0) {
-            if (rt->activityCallback)
-                rt->activityCallback(rt->activityCallbackArg, false);
-        }
+        if (rt->activityCallback)
+            rt->activityCallback(rt->activityCallbackArg, false);
     }
 }
 #endif /* JS_THREADSAFE */

js/src/jscntxt.cpp

@@ -245,13 +245,7 @@ js_DestroyContext(JSContext *cx, JSDestroyContextMode mode)
     JS_ASSERT(!cx->enumerators);
 
 #ifdef JS_THREADSAFE
-    /*
-     * For API compatibility we support destroying contexts with non-zero
-     * cx->outstandingRequests but we assume that all JS_BeginRequest calls
-     * on this cx contributes to cx->thread->data.requestDepth and there is no
-     * JS_SuspendRequest calls that set aside the counter.
-     */
-    JS_ASSERT(cx->outstandingRequests <= cx->runtime->requestDepth);
+    JS_ASSERT(cx->outstandingRequests == 0);
 #endif
 
     if (mode != JSDCM_NEW_FAILED) {
@@ -268,11 +262,7 @@ js_DestroyContext(JSContext *cx, JSDestroyContextMode mode)
     JS_LOCK_GC(rt);
     JS_REMOVE_LINK(&cx->link);
     bool last = !rt->hasContexts();
-    if (last || mode == JSDCM_FORCE_GC || mode == JSDCM_MAYBE_GC
-#ifdef JS_THREADSAFE
-        || cx->outstandingRequests != 0
-#endif
-        ) {
+    if (last || mode == JSDCM_FORCE_GC || mode == JSDCM_MAYBE_GC) {
         JS_ASSERT(!rt->gcRunning);
 
 #ifdef JS_THREADSAFE
@@ -281,16 +271,6 @@ js_DestroyContext(JSContext *cx, JSDestroyContextMode mode)
         JS_UNLOCK_GC(rt);
 
         if (last) {
-#ifdef JS_THREADSAFE
-            /*
-             * If this thread is not in a request already, begin one now so
-             * that we wait for any racing GC started on a not-last context to
-             * finish, before we plow ahead and unpin atoms.
-             */
-            if (cx->runtime->requestDepth == 0)
-                JS_BeginRequest(cx);
-#endif
-
             /*
              * Dump remaining type inference results first. This printing
              * depends on atoms still existing.
@@ -308,27 +288,15 @@ js_DestroyContext(JSContext *cx, JSDestroyContextMode mode)
             for (CompartmentsIter c(rt); !c.done(); c.next())
                 c->clearTraps(cx);
             JS_ClearAllWatchPoints(cx);
-        }
 
-#ifdef JS_THREADSAFE
-        /* Destroying a context implicitly calls JS_EndRequest(). */
-        while (cx->outstandingRequests != 0)
-            JS_EndRequest(cx);
-#endif
-
-        if (last) {
             js_GC(cx, NULL, GC_NORMAL, gcreason::LAST_CONTEXT);
 
-            /* Take the runtime down, now that it has no contexts or atoms. */
-            JS_LOCK_GC(rt);
-        } else {
-            if (mode == JSDCM_FORCE_GC)
-                js_GC(cx, NULL, GC_NORMAL, gcreason::DESTROY_CONTEXT);
-            else if (mode == JSDCM_MAYBE_GC)
-                JS_MaybeGC(cx);
-
-            JS_LOCK_GC(rt);
+        } else if (mode == JSDCM_FORCE_GC) {
+            js_GC(cx, NULL, GC_NORMAL, gcreason::DESTROY_CONTEXT);
+        } else if (mode == JSDCM_MAYBE_GC) {
+            JS_MaybeGC(cx);
         }
+        JS_LOCK_GC(rt);
     }
 #ifdef JS_THREADSAFE
     rt->gcHelperThread.waitBackgroundSweepEnd();
@@ -352,21 +320,6 @@ js_ContextIterator(JSRuntime *rt, JSBool unlocked, JSContext **iterp)
     return cx;
 }
 
-JS_FRIEND_API(JSContext *)
-js_NextActiveContext(JSRuntime *rt, JSContext *cx)
-{
-    JSContext *iter = cx;
-#ifdef JS_THREADSAFE
-    while ((cx = js_ContextIterator(rt, JS_FALSE, &iter)) != NULL) {
-        if (cx->outstandingRequests && cx->runtime->requestDepth)
-            break;
-    }
-    return cx;
-#else
-    return js_ContextIterator(rt, JS_FALSE, &iter);
-#endif
-}
-
 namespace js {
 
 bool

js/src/jscntxt.h

@@ -453,7 +453,6 @@ struct JSRuntime
 #ifdef JS_THREADSAFE
     /* These combine to interlock the GC and new requests. */
     PRLock              *gcLock;
-    uint32_t            requestCount;
 
     js::GCHelperThread  gcHelperThread;
 #endif /* JS_THREADSAFE */
@@ -1364,14 +1363,6 @@ js_DestroyContext(JSContext *cx, JSDestroyContextMode mode);
 extern JSContext *
 js_ContextIterator(JSRuntime *rt, JSBool unlocked, JSContext **iterp);
 
-/*
- * Iterate through contexts with active requests. The caller must be holding
- * rt->gcLock in case of a thread-safe build, or otherwise guarantee that the
- * context list is not alternated asynchroniously.
- */
-extern JS_FRIEND_API(JSContext *)
-js_NextActiveContext(JSRuntime *, JSContext *);
-
 #ifdef va_start
 extern JSBool
 js_ReportErrorVA(JSContext *cx, uintN flags, const char *format, va_list ap);

js/xpconnect/shell/xpcshell.cpp

@@ -2012,6 +2012,7 @@ main(int argc, char **argv, char **envp)
             cxstack = nsnull;
             JS_GC(cx);
         } //this scopes the JSAutoCrossCompartmentCall
+        JS_EndRequest(cx);
         JS_DestroyContext(cx);
     } // this scopes the nsCOMPtrs