Zygote

zygote 孵化器是 Android 应用进程的模板，通过其 fork 出来。 Zygote初始化最后进入 select 循环，等待客户端的请求 fork 应用进程。

Android Zygote Fork_第1张图片

frameworks/base/core/java/com/android/internal/os/ZygoteServer.java

Runnable runSelectLoop(String abiList) {    ......    while(true) {        StructPollfd[] pollFds = new StructPollfd[fds.size()];        ......        try {            Os.poll(pollFds, -1);        }        for (int i = pollFds.length -1 ; i >= 0; i--) {            if ((pollFds[i].revents & POLLIN) == 0) {                continue;            }            if (i == 0) {                ZygoteConnection newPeer = acceptCommandPeer(abiList);                peers.add(newPeer);                fds.add(newPeer.getFileDescriptor());            } else {                ZygoteConnection connection = peers.get(i);                final Runnable command = connection.processOneCommand(this);                return command;                ......            }        }    }}

frameworks/base/core/java/com/android/internal/os/ZygoteConnection.java

Runnable processOneCommand(ZygoteServer zygoteServer) {    ......    pid = Zygote.forkAndSpecialize(...);    try {        if (pid == 0) {            // in child            ......            return handleChildProc(...);        } else {            // In the parent            handleParentProc(...)            return null;        }    }}

Android Zygote Fork

Zygote

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