Merge branch 'profile-gui'

[apitrace] / common / trace_writer_local.cpp

diff --git a/common/trace_writer_local.cpp b/common/trace_writer_local.cpp
index bb06d90f74783f53f9d7bed795811fc7ac9fa251..5aeedac520febb823ad08e86aa10bd30a05a24ca 100644 (file)
--- a/common/trace_writer_local.cpp
+++ b/common/trace_writer_local.cpp
@@ -34,7 +34,7 @@
 #include "os_thread.hpp"
 #include "os_string.hpp"
 #include "trace_file.hpp"
-#include "trace_writer.hpp"
+#include "trace_writer_local.hpp"
 #include "trace_format.hpp"
 
 
@@ -89,7 +89,11 @@ LocalWriter::open(void) {
 #endif
         process.trimDirectory();
 
-        os::String prefix = os::getCurrentDir();
+#ifdef ANDROID
+       os::String prefix = "/data";
+#else
+       os::String prefix = os::getCurrentDir();
+#endif
         prefix.join(process);
 
         for (;;) {
@@ -124,27 +128,39 @@ LocalWriter::open(void) {
 #endif
 }
 
+static unsigned next_thread_id = 0;
+static os::thread_specific_ptr<unsigned> thread_id_specific_ptr;
+
 unsigned LocalWriter::beginEnter(const FunctionSig *sig) {
-    os::acquireMutex();
+    mutex.lock();
     ++acquired;
 
     if (!m_file->isOpened()) {
         open();
     }
 
-    os::thread::id id = os::this_thread::get_id();
+    unsigned *thread_id_ptr = thread_id_specific_ptr.get();
+    unsigned thread_id;
+    if (thread_id_ptr) {
+        thread_id = *thread_id_ptr;
+    } else {
+        thread_id = next_thread_id++;
+        thread_id_ptr = new unsigned;
+        *thread_id_ptr = thread_id;
+        thread_id_specific_ptr.reset(thread_id_ptr);
+    }
 
-    return Writer::beginEnter(sig, static_cast<unsigned>(id));
+    return Writer::beginEnter(sig, thread_id);
 }
 
 void LocalWriter::endEnter(void) {
     Writer::endEnter();
     --acquired;
-    os::releaseMutex();
+    mutex.unlock();
 }
 
 void LocalWriter::beginLeave(unsigned call) {
-    os::acquireMutex();
+    mutex.lock();
     ++acquired;
     Writer::beginLeave(call);
 }
@@ -152,23 +168,28 @@ void LocalWriter::beginLeave(unsigned call) {
 void LocalWriter::endLeave(void) {
     Writer::endLeave();
     --acquired;
-    os::releaseMutex();
+    mutex.unlock();
 }
 
 void LocalWriter::flush(void) {
     /*
      * Do nothing if the mutex is already acquired (e.g., if a segfault happen
-     * while writing the file) to prevent dead-lock.
+     * while writing the file) as state could be inconsistent, therefore yield
+     * inconsistent trace files and/or repeated segfaults till infinity.
      */
 
-    if (!acquired) {
-        os::acquireMutex();
+    mutex.lock();
+    if (acquired) {
+        os::log("apitrace: ignoring exception while tracing\n");
+    } else {
+        ++acquired;
         if (m_file->isOpened()) {
             os::log("apitrace: flushing trace due to an exception\n");
             m_file->flush();
         }
-        os::releaseMutex();
+        --acquired;
     }
+    mutex.unlock();
 }