From cf9a801ebcb4df0a8b1ea75e58ca8ea8960ba13b Mon Sep 17 00:00:00 2001
From: Pixel <pixel@nobis-crew.org>
Date: Sun, 9 Oct 2011 22:58:44 -0700
Subject: Adding basic locks from libpthread. Also, that 'pending' loop belongs
 after we activate the tasks.

---
 Makefile           |  1 +
 includes/TaskMan.h |  2 ++
 includes/Threads.h | 17 +++++++++++++++++
 src/TaskMan.cc     | 27 +++++++++++++--------------
 src/Threads.cc     | 13 +++++++++++++
 5 files changed, 46 insertions(+), 14 deletions(-)
 create mode 100644 includes/Threads.h
 create mode 100644 src/Threads.cc

diff --git a/Makefile b/Makefile
index 5d0ed2b..f0424e3 100644
--- a/Makefile
+++ b/Makefile
@@ -62,6 +62,7 @@ Main.cc \
 Printer.cc \
 Task.cc \
 TaskMan.cc \
+Threads.cc \
 
 LIBCORO_SOURCES = \
 coro.c \
diff --git a/includes/TaskMan.h b/includes/TaskMan.h
index d8d0c80..fd00172 100644
--- a/includes/TaskMan.h
+++ b/includes/TaskMan.h
@@ -5,6 +5,7 @@
 #include <ev++.h>
 #include <ext/hash_set>
 #include <vector>
+#include <Threads.h>
 
 namespace gnu = __gnu_cxx;
 
@@ -32,6 +33,7 @@ class TaskMan {
     typedef std::vector<Task *> taskList_t;
     taskHash_t m_tasks, m_signaledTasks;
     taskList_t m_pendingAdd;
+    Lock m_pendingLock;
     volatile bool m_stopped;
     struct ev_loop * m_loop;
 };
diff --git a/includes/Threads.h b/includes/Threads.h
new file mode 100644
index 0000000..5a4ef61
--- /dev/null
+++ b/includes/Threads.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <pthread.h>
+
+namespace Balau {
+
+class Lock {
+  public:
+      Lock();
+      ~Lock() { pthread_mutex_destroy(&m_lock); }
+    void enter() { pthread_mutex_lock(&m_lock); }
+    void leave() { pthread_mutex_unlock(&m_lock); }
+  private:
+    pthread_mutex_t m_lock;
+};
+
+};
diff --git a/src/TaskMan.cc b/src/TaskMan.cc
index a9ad709..fd0246f 100644
--- a/src/TaskMan.cc
+++ b/src/TaskMan.cc
@@ -33,21 +33,10 @@ void Balau::TaskMan::mainLoop() {
         // checking "STARTING" tasks, and running them once
         for (iH = m_tasks.begin(); iH != m_tasks.end(); iH++) {
             t = *iH;
-            if (t->getStatus() == Task::STARTING) {
+            if (t->getStatus() == Task::STARTING)
                 t->switchTo();
-            }
         }
 
-        // lock pending
-        // Adding tasks that were added, maybe from other threads
-        for (iL = m_pendingAdd.begin(); iL != m_pendingAdd.end(); iL++) {
-            t = *iL;
-            Assert(m_tasks.find(t) == m_tasks.end());
-            m_tasks.insert(t);
-        }
-        m_pendingAdd.clear();
-        // unlock pending
-
         ev_run(m_loop, EVRUN_ONCE);
 
         // let's check who got signaled, and call them
@@ -56,6 +45,16 @@ void Balau::TaskMan::mainLoop() {
             t->switchTo();
         }
 
+        m_pendingLock.enter();
+        // Adding tasks that were added, maybe from other threads
+        for (iL = m_pendingAdd.begin(); iL != m_pendingAdd.end(); iL++) {
+            t = *iL;
+            Assert(m_tasks.find(t) == m_tasks.end());
+            m_tasks.insert(t);
+        }
+        m_pendingAdd.clear();
+        m_pendingLock.leave();
+
         // Dealing with stopped and faulted tasks.
         // First by signalling the waiters.
         for (iH = m_tasks.begin(); iH != m_tasks.end(); iH++) {
@@ -93,9 +92,9 @@ void Balau::TaskMan::mainLoop() {
 }
 
 void Balau::TaskMan::registerTask(Balau::Task * t) {
-    // lock pending
+    m_pendingLock.enter();
     m_pendingAdd.push_back(t);
-    // unlock pending
+    m_pendingLock.leave();
 }
 
 void Balau::TaskMan::signalTask(Task * t) {
diff --git a/src/Threads.cc b/src/Threads.cc
new file mode 100644
index 0000000..7c928f8
--- /dev/null
+++ b/src/Threads.cc
@@ -0,0 +1,13 @@
+#include <Exceptions.h>
+#include <Threads.h>
+
+Balau::Lock::Lock() {
+    int r;
+    pthread_mutexattr_t attr;
+    r = pthread_mutexattr_init(&attr);
+    Assert(r == 0);
+    r = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+    Assert(r == 0);
+    r = pthread_mutex_init(&m_lock, &attr);
+    Assert(r == 0);
+}
-- 
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