adb: more immediately try to reconnect connections.
Most disconnects we're likely to encounter are cases where either we
notice immediately and can start reconnecting almost immediately (adbd
restarting because of `adb root`, etc.), or where we won't notice for a
while anyway, so a 10 second sleep is somewhat meaningless.
Test: adb root; time adb wait-for-device shell
Change-Id: I18e9213dc4e84d735e9240118a368dcb38f21c78
diff --git a/adb/transport.cpp b/adb/transport.cpp
index b08c7f9..b45c43f 100644
--- a/adb/transport.cpp
+++ b/adb/transport.cpp
@@ -50,6 +50,7 @@
#include "adb_trace.h"
#include "adb_utils.h"
#include "fdevent.h"
+#include "sysdeps/chrono.h"
static void register_transport(atransport* transport);
static void remove_transport(atransport* transport);
@@ -104,10 +105,16 @@
atransport* transport;
std::chrono::steady_clock::time_point reconnect_time;
size_t attempts_left;
+
+ bool operator<(const ReconnectAttempt& rhs) const {
+ // std::priority_queue returns the largest element first, so we want attempts that have
+ // less time remaining (i.e. smaller time_points) to compare greater.
+ return reconnect_time > rhs.reconnect_time;
+ }
};
// Only retry for up to one minute.
- static constexpr const std::chrono::seconds kDefaultTimeout = std::chrono::seconds(10);
+ static constexpr const std::chrono::seconds kDefaultTimeout = 10s;
static constexpr const size_t kMaxAttempts = 6;
// Protects all members.
@@ -115,7 +122,7 @@
bool running_ GUARDED_BY(reconnect_mutex_) = true;
std::thread handler_thread_;
std::condition_variable reconnect_cv_;
- std::queue<ReconnectAttempt> reconnect_queue_ GUARDED_BY(reconnect_mutex_);
+ std::priority_queue<ReconnectAttempt> reconnect_queue_ GUARDED_BY(reconnect_mutex_);
DISALLOW_COPY_AND_ASSIGN(ReconnectHandler);
};
@@ -137,7 +144,7 @@
// Drain the queue to free all resources.
std::lock_guard<std::mutex> lock(reconnect_mutex_);
while (!reconnect_queue_.empty()) {
- ReconnectAttempt attempt = reconnect_queue_.front();
+ ReconnectAttempt attempt = reconnect_queue_.top();
reconnect_queue_.pop();
remove_transport(attempt.transport);
}
@@ -148,9 +155,10 @@
{
std::lock_guard<std::mutex> lock(reconnect_mutex_);
if (!running_) return;
- reconnect_queue_.emplace(ReconnectAttempt{
- transport, std::chrono::steady_clock::now() + ReconnectHandler::kDefaultTimeout,
- ReconnectHandler::kMaxAttempts});
+ // Arbitrary sleep to give adbd time to get ready, if we disconnected because it exited.
+ auto reconnect_time = std::chrono::steady_clock::now() + 250ms;
+ reconnect_queue_.emplace(
+ ReconnectAttempt{transport, reconnect_time, ReconnectHandler::kMaxAttempts});
}
reconnect_cv_.notify_one();
}
@@ -167,7 +175,7 @@
// system_clock as its clock, so we're probably hosed if the clock changes,
// even if we use steady_clock throughout. This problem goes away once we
// switch to libc++.
- reconnect_cv_.wait_until(lock, reconnect_queue_.front().reconnect_time);
+ reconnect_cv_.wait_until(lock, reconnect_queue_.top().reconnect_time);
} else {
reconnect_cv_.wait(lock);
}
@@ -178,11 +186,11 @@
// Go back to sleep in case |reconnect_cv_| woke up spuriously and we still
// have more time to wait for the current attempt.
auto now = std::chrono::steady_clock::now();
- if (reconnect_queue_.front().reconnect_time > now) {
+ if (reconnect_queue_.top().reconnect_time > now) {
continue;
}
- attempt = reconnect_queue_.front();
+ attempt = reconnect_queue_.top();
reconnect_queue_.pop();
if (attempt.transport->kicked()) {
D("transport %s was kicked. giving up on it.", attempt.transport->serial.c_str());