Merge "init: fix process restarting"

am: eb3fa92191

Change-Id: Ic03cf607631c49c1d37584f7641d9300a79f5457

3 files changed, 26 insertions, 40 deletions

diff --git a/init/init.cpp b/init/init.cpp
index c51217e9b..58410982e 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -53,6 +53,7 @@
 
 #include <fstream>
 #include <memory>
+#include <optional>
 #include <vector>
 
 #include "bootchart.h"
@@ -84,7 +85,6 @@ static int property_triggers_enabled = 0;
 static char qemu[32];
 
 std::string default_console = "/dev/console";
-static time_t process_needs_restart_at;
 
 const char *ENV[32];
 
@@ -219,12 +219,21 @@ void property_changed(const std::string& name, const std::string& value) {
     }
 }
 
-static void restart_processes()
-{
-    process_needs_restart_at = 0;
-    ServiceManager::GetInstance().ForEachServiceWithFlags(SVC_RESTARTING, [](Service* s) {
-        s->RestartIfNeeded(&process_needs_restart_at);
+static std::optional<boot_clock::time_point> RestartProcesses() {
+    std::optional<boot_clock::time_point> next_process_restart_time;
+    ServiceManager::GetInstance().ForEachService([&next_process_restart_time](Service* s) {
+        if (!(s->flags() & SVC_RESTARTING)) return;
+
+        auto restart_time = s->time_started() + 5s;
+        if (boot_clock::now() > restart_time) {
+            s->Start();
+        } else {
+            if (!next_process_restart_time || restart_time < *next_process_restart_time) {
+                next_process_restart_time = restart_time;
+            }
+        }
     });
+    return next_process_restart_time;
 }
 
 void handle_control_message(const std::string& msg, const std::string& name) {
@@ -1206,12 +1215,16 @@ int main(int argc, char** argv) {
             am.ExecuteOneCommand();
         }
         if (!(waiting_for_prop || sm.IsWaitingForExec())) {
-            if (!shutting_down) restart_processes();
-
-            // If there's a process that needs restarting, wake up in time for that.
-            if (process_needs_restart_at != 0) {
-                epoll_timeout_ms = (process_needs_restart_at - time(nullptr)) * 1000;
-                if (epoll_timeout_ms < 0) epoll_timeout_ms = 0;
+            if (!shutting_down) {
+                auto next_process_restart_time = RestartProcesses();
+
+                // If there's a process that needs restarting, wake up in time for that.
+                if (next_process_restart_time) {
+                    epoll_timeout_ms = std::chrono::ceil<std::chrono::milliseconds>(
+                                           *next_process_restart_time - boot_clock::now())
+                                           .count();
+                    if (epoll_timeout_ms < 0) epoll_timeout_ms = 0;
+                }
             }
 
             // If there's more work to do, wake up again immediately.
diff --git a/init/service.cpp b/init/service.cpp
index d0a0751cf..d72433afa 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -890,22 +890,6 @@ void Service::Restart() {
     } /* else: Service is restarting anyways. */
 }
 
-void Service::RestartIfNeeded(time_t* process_needs_restart_at) {
-    boot_clock::time_point now = boot_clock::now();
-    boot_clock::time_point next_start = time_started_ + 5s;
-    if (now > next_start) {
-        flags_ &= (~SVC_RESTARTING);
-        Start();
-        return;
-    }
-
-    time_t next_start_time_t = time(nullptr) +
-        time_t(std::chrono::duration_cast<std::chrono::seconds>(next_start - now).count());
-    if (next_start_time_t < *process_needs_restart_at || *process_needs_restart_at == 0) {
-        *process_needs_restart_at = next_start_time_t;
-    }
-}
-
 // The how field should be either SVC_DISABLED, SVC_RESET, or SVC_RESTART.
 void Service::StopOrReset(int how) {
     // The service is still SVC_RUNNING until its process exits, but if it has
@@ -1123,15 +1107,6 @@ void ServiceManager::ForEachServiceInClass(const std::string& classname,
     }
 }
 
-void ServiceManager::ForEachServiceWithFlags(unsigned matchflags,
-                                             void (*func)(Service* svc)) const {
-    for (const auto& s : services_) {
-        if (s->flags() & matchflags) {
-            func(s.get());
-        }
-    }
-}
-
 void ServiceManager::RemoveService(const Service& svc) {
     auto svc_it = std::find_if(services_.begin(), services_.end(),
                                [&svc] (const std::unique_ptr<Service>& s) {
diff --git a/init/service.h b/init/service.h
index 976f431e0..850aca487 100644
--- a/init/service.h
+++ b/init/service.h
@@ -83,7 +83,6 @@ class Service {
     void Stop();
     void Terminate();
     void Restart();
-    void RestartIfNeeded(time_t* process_needs_restart_at);
     void Reap();
     void DumpState() const;
     void SetShutdownCritical() { flags_ |= SVC_SHUTDOWN_CRITICAL; }
@@ -94,6 +93,7 @@ class Service {
     const std::set<std::string>& classnames() const { return classnames_; }
     unsigned flags() const { return flags_; }
     pid_t pid() const { return pid_; }
+    android::base::boot_clock::time_point time_started() const { return time_started_; }
     int crash_count() const { return crash_count_; }
     uid_t uid() const { return uid_; }
     gid_t gid() const { return gid_; }
@@ -217,8 +217,6 @@ class ServiceManager {
     void ForEachServiceShutdownOrder(const std::function<void(Service*)>& callback) const;
     void ForEachServiceInClass(const std::string& classname,
                                void (*func)(Service* svc)) const;
-    void ForEachServiceWithFlags(unsigned matchflags,
-                             void (*func)(Service* svc)) const;
     void ReapAnyOutstandingChildren();
     void RemoveService(const Service& svc);
     void DumpState() const;