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Fix race condition when multiple threads write to MultiplexStream simultaneously

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This commit is contained in:
rdb 2016-06-23 22:56:18 +02:00
parent 9b5ff08011
commit 7266f5ae68
2 changed files with 7 additions and 13 deletions
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18
panda/src/downloader/multiplexStreamBuf.cxx
View File

@ -12,6 +12,7 @@
*/
#include "multiplexStreamBuf.h"
#include "lightMutexHolder.h"
#if defined(WIN32_VC) || defined(WIN64_VC)
#define WINDOWS_LEAN_AND_MEAN
@ -113,10 +114,8 @@ void MultiplexStreamBuf::
add_output(MultiplexStreamBuf::BufferType buffer_type,
MultiplexStreamBuf::OutputType output_type,
ostream *out, FILE *fout, bool owns_obj) {
#ifdef OLD_HAVE_IPC
// Ensure that we have the mutex while we fiddle with the list of outputs.
mutex_lock m(_lock);
#endif
LightMutexHolder holder(_lock);
Output o;
o._buffer_type = buffer_type;
@ -133,9 +132,7 @@ add_output(MultiplexStreamBuf::BufferType buffer_type,
*/
void MultiplexStreamBuf::
flush() {
#ifdef OLD_HAVE_IPC
mutex_lock m(_lock);
#endif
LightMutexHolder holder(_lock);
write_chars("", 0, true);
}
@ -146,9 +143,7 @@ flush() {
*/
int MultiplexStreamBuf::
overflow(int ch) {
#ifdef OLD_HAVE_IPC
mutex_lock m(_lock);
#endif
LightMutexHolder holder(_lock);
streamsize n = pptr() - pbase();
@ -172,9 +167,7 @@ overflow(int ch) {
*/
int MultiplexStreamBuf::
sync() {
#ifdef OLD_HAVE_IPC
mutex_lock m(_lock);
#endif
LightMutexHolder holder(_lock);
streamsize n = pptr() - pbase();
@ -242,5 +235,4 @@ write_chars(const char *start, int length, bool flush) {
break;
}
}
}

2
panda/src/downloader/multiplexStreamBuf.h
View File

@ -17,6 +17,7 @@
#include "pandabase.h"
#include "pvector.h"
#include "lightMutex.h"
#include <stdio.h>
/**
@ -69,6 +70,7 @@ private:
typedef pvector<Output> Outputs;
Outputs _outputs;
LightMutex _lock;
string _line_buffer;
};