From 5020e611bbffd51bb8cebd3790f8537b7eb4c03c Mon Sep 17 00:00:00 2001
From: Rahul Sundararaman <rahul.sundararaman@10gen.com>
Date: Tue, 23 Jul 2019 13:57:25 -0400
Subject: SERVER-41362 Attach diagnostic captures to OperationContexts

---
 src/mongo/platform/SConscript     |  3 ---
 src/mongo/platform/mutex.cpp      | 21 ++++++++++++++++++++-
 src/mongo/platform/mutex.h        | 10 ++++++++++
 src/mongo/platform/mutex_test.cpp |  5 -----
 4 files changed, 30 insertions(+), 9 deletions(-)

(limited to 'src/mongo/platform')

diff --git a/src/mongo/platform/SConscript b/src/mongo/platform/SConscript
index 171a183fa45..6ccbf7f77ce 100644
--- a/src/mongo/platform/SConscript
+++ b/src/mongo/platform/SConscript
@@ -17,7 +17,4 @@ env.CppUnitTest(
         'decimal128_bson_test.cpp',
         'overflow_arithmetic_test.cpp'
     ],
-    LIBDEPS=[
-        '$BUILD_DIR/mongo/db/service_context'
-    ]
 )
\ No newline at end of file
diff --git a/src/mongo/platform/mutex.cpp b/src/mongo/platform/mutex.cpp
index c81783f4bd7..b5661cf6f53 100644
--- a/src/mongo/platform/mutex.cpp
+++ b/src/mongo/platform/mutex.cpp
@@ -31,16 +31,35 @@
 
 namespace mongo {
 
+namespace {
+std::unique_ptr<LockActions> gLockActions;
+}
+
 void Mutex::lock() {
-    auto hasLock = _mutex.try_lock_for(_lockTimeout.toSystemDuration());
+    auto hasLock = _mutex.try_lock_for(kContendedLockTimeout.toSystemDuration());
+    if (hasLock) {
+        return;
+    }
+    if (gLockActions) {
+        gLockActions->onContendedLock(_name);
+    }
+    hasLock = _mutex.try_lock_for(_lockTimeout.toSystemDuration() -
+                                  kContendedLockTimeout.toSystemDuration());
     uassert(
         ErrorCodes::InternalError, "Unable to take latch, wait time exceeds set timeout", hasLock);
 }
 void Mutex::unlock() {
+    if (gLockActions) {
+        gLockActions->onUnlock();
+    }
     _mutex.unlock();
 }
 bool Mutex::try_lock() {
     return _mutex.try_lock();
 }
 
+void Mutex::setLockActions(std::unique_ptr<LockActions> actions) {
+    gLockActions = std::move(actions);
+}
+
 }  // namespace mongo
diff --git a/src/mongo/platform/mutex.h b/src/mongo/platform/mutex.h
index a0be7ae971d..bb885d0cbe1 100644
--- a/src/mongo/platform/mutex.h
+++ b/src/mongo/platform/mutex.h
@@ -36,6 +36,13 @@
 
 namespace mongo {
 
+class LockActions {
+public:
+    virtual ~LockActions() = default;
+    virtual void onContendedLock(const StringData& name) = 0;
+    virtual void onUnlock() = 0;
+};
+
 class Mutex {
 public:
     Mutex() : Mutex("AnonymousMutex"_sd) {}
@@ -48,9 +55,12 @@ public:
         return _name;
     }
 
+    static void setLockActions(std::unique_ptr<LockActions> actions);
+
 private:
     const StringData _name;
     const Seconds _lockTimeout = Seconds(60);
+    static constexpr Milliseconds kContendedLockTimeout = Milliseconds(100);
     stdx::timed_mutex _mutex;
 };
 
diff --git a/src/mongo/platform/mutex_test.cpp b/src/mongo/platform/mutex_test.cpp
index 895914c529b..6c6674aa197 100644
--- a/src/mongo/platform/mutex_test.cpp
+++ b/src/mongo/platform/mutex_test.cpp
@@ -29,15 +29,10 @@
 
 #include "mongo/unittest/unittest.h"
 
-#include "mongo/db/service_context.h"
 #include "mongo/platform/mutex.h"
-#include "mongo/stdx/thread.h"
 
 namespace mongo {
 TEST(MongoMutexTest, BasicSingleThread) {
-    auto serviceContext = ServiceContext::make();
-    setGlobalServiceContext(std::move(serviceContext));
-
     Mutex m;
     m.lock();
     ASSERT(!m.try_lock());
-- 
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