[GitHub] [incubator-weex] lb4110991 commented on issue #3255: [Android]Android 11 Not working properly

[GitBox <gi...@apache.org>]

lb4110991 commented on issue #3255:
URL: https://github.com/apache/incubator-weex/issues/3255#issuecomment-737890574


   > I found the result of **fork() is not 0**, so enter the condition three. m_impl->futexPageQueue->spinWaitPeer() will call **sched_yield()**,until **timeout**.
   > 
   > I am puzzled, what has changed in fork(), on android11 ​​phones.
   > 
   > IPCSender *WeexJSConnection::start(bool reinit) {
   > ......
   > 
   > // static bool startupPie = s_start_pie;
   > static bool startupPie = SoUtils::pie_support();
   > LOGE("startupPie :%d", startupPie);
   > 
   > pid_t child;
   > if (reinit) {
   > #if PRINT_LOG_CACHEFILE
   > mcfile << "reinit is ture use vfork" << std::endl;
   > mcfile.close();
   > #endif
   > child = vfork();
   > } else {
   > #if PRINT_LOG_CACHEFILE
   > mcfile << "reinit is false use fork" << std::endl;
   > mcfile.close();
   > #endif
   > child = fork();
   > }
   > LOGD("fork result=%d", child);
   > if (child == -1) {
   > int myerrno = errno;
   > munmap(base, IPCFutexPageQueue::ipc_size);
   > throw IPCException("failed to fork: %s", strerror(myerrno));
   > } else if (child == 0 || child == 6743) {
   > LOGE("weexcore fork child success\n");
   > // the child
   > closeAllButThis(client_->ipcFd, server_->ipcFd);
   > // implements close all but handles[1]
   > // do exec
   > doExec(client_->ipcFd, server_->ipcFd, true, startupPie);
   > LOGE("exec Failed completely.");
   > // failed to exec
   > _exit(1);
   > } else {
   > **//step into here ====condition three**
   > printLogOnFile("fork success on main process and start m_impl->futexPageQueue->spinWaitPeer()");
   > LOGD("fork success on main process and start m_impl->futexPageQueue->spinWaitPeer()");
   > m_impl->child = child;
   > try {
   > m_impl->futexPageQueue->spinWaitPeer();
   > } catch (IPCException &e) {
   > LOGE("WeexJSConnection catch: %s", e.msg());
   > // TODO throw exception
   > if(s_in_find_icu) {
   > // WeexCore::WeexProxy::reportNativeInitStatus("-1013", "find icu timeout");
   > }
   > return nullptr;
   > }
   > }
   > return m_impl->serverSender.get();
   > }
   
   hello, Have you solved this problem？


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