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Diffstat (limited to 'cmds/runtime/SignalHandler.h')
-rw-r--r-- | cmds/runtime/SignalHandler.h | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/cmds/runtime/SignalHandler.h b/cmds/runtime/SignalHandler.h deleted file mode 100644 index 7f4ef8e..0000000 --- a/cmds/runtime/SignalHandler.h +++ /dev/null @@ -1,137 +0,0 @@ -// -// Copyright 2005 The Android Open Source Project -// -#ifndef ANDROID_SIGNAL_HANDLER_H -#define ANDROID_SIGNAL_HANDLER_H - -#include <utils/KeyedVector.h> -#include <utils/threads.h> - -#include <signal.h> - -namespace android { - -// ---------------------------------------------------------------------- - -enum { - DEFAULT_PROCESS_TAG = 1 -}; - -class SignalHandler -{ -public: - typedef void (*child_callback_t)(pid_t child, void* userData); - - /** - * Set a handler for when a child process exits. By calling - * this, a waitpid() will be done when the child exits to remove - * it from the zombie state. You can also optionally specify a - * handler to be called when the child exits. - * - * If there is already a handler for this child process, it is - * replaced by this new handler. In this case the old handler's - * function is not called. - * - * @param childPid Process ID of child to watch. - * @param childTag User-defined tag for this child. Must be - * greater than zero. - * @param handler If non-NULL, this will be called when the - * child exits. It may be called in either a - * separate signal handling thread, or - * immediately if the child has already exited. - * @param userData Propageted as-is to handler. - * - * @return status_t NO_ERROR if all is well. - */ - static status_t setChildHandler(pid_t childPid, - int childTag = DEFAULT_PROCESS_TAG, - child_callback_t handler = NULL, - void* userData = NULL); - - /** - * Kill all of the child processes for which we have a waiting - * handler, whose tag is the given value. If tag is 0, all - * children are killed. - * - * @param tag - */ - static void killAllChildren(int tag = 0); - -private: - SignalHandler(); - ~SignalHandler(); - - static SignalHandler* getInstance(); - - static void sigAction(int, siginfo_t*, void*); - - // -------------------------------------------------- - // Shared state... all of this is protected by mLock. - // -------------------------------------------------- - - mutable Mutex mLock; - - struct ChildHandler - { - pid_t childPid; - int tag; - child_callback_t handler; - void* userData; - }; - KeyedVector<pid_t, ChildHandler> mChildHandlers; - - // -------------------------------------------------- - // Commmand queue... data is inserted by the signal - // handler using atomic ops, and retrieved by the - // signal processing thread. Because these are touched - // by the signal handler, no lock is used. - // -------------------------------------------------- - - enum { - COMMAND_QUEUE_SIZE = 64 - }; - struct CommandEntry - { - int filled; - int signum; - siginfo_t info; - }; - - // The top of the queue. This is incremented atomically by the - // signal handler before placing a command in the queue. - volatile int32_t mCommandTop; - - // The bottom of the queue. Only modified by the processing - // thread; the signal handler reads it only to determine if the - // queue is full. - int32_t mCommandBottom; - - // Incremented each time we receive a signal and don't have room - // for it on the command queue. - volatile int32_t mLostCommands; - - // The command processing thread. - class ProcessThread; - sp<Thread> mProcessThread; - - // Pipe used to tell command processing thread when new commands. - // are available. The thread blocks on the read end, the signal - // handler writes when it enqueues new commands. - int mAvailMsg[2]; - - // The commands. - CommandEntry mCommands[COMMAND_QUEUE_SIZE]; - - // -------------------------------------------------- - // Singleton. - // -------------------------------------------------- - - static Mutex mInstanceLock; - static SignalHandler* mInstance; -}; - -// ---------------------------------------------------------------------- - -}; // namespace android - -#endif // ANDROID_SIGNAL_HANDLER_H |