Core: FileStream NOWRITESHARE implemented for Linux,BSD using flock

git-svn-id: svn://ultimatepp.org/upp/trunk@4641 f0d560ea-af0d-0410-9eb7-867de7ffcac7

uppsrc/Core/BlockStream.cpp

@@ -473,6 +473,11 @@ bool FileStream::Open(const char *name, dword mode, mode_t tmode) {
 	                    O_RDWR|O_CREAT,
 	              tmode);
 	if(handle >= 0) {
+		if((mode & NOWRITESHARE) && flock(handle, LOCK_EX|LOCK_NB) < 0) {
+			close(handle);
+			handle = -1;
+			return false;
+		}
 		int64 fsz = LSEEK64_(handle, 0, SEEK_END);
 		if(fsz >= 0) {
 			OpenInit(mode, fsz);
@@ -508,6 +513,20 @@ FileStream::~FileStream() {
 	Close();
 }
 
+#ifdef PLATFORM_POSIX
+bool FileOut::Open(const char *fn, mode_t acm)
+{
+	return FileStream::Open(fn, FileStream::CREATE|FileStream::NOWRITESHARE, acm);
+}
+#endif
+
+#ifdef PLATFORM_WIN32
+bool FileOut::Open(const char *fn)
+{
+	return FileStream::Open(fn, FileStream::CREATE|FileStream::NOWRITESHARE);
+}
+#endif
+
 #endif
 
 END_UPP_NAMESPACE

uppsrc/Core/Core.h

@@ -60,6 +60,7 @@
 	#include <sys/types.h>
 	#include <sys/stat.h>
 	#include <sys/time.h>
+	#include <sys/file.h>
 	#include <time.h>
 	#include <fcntl.h>
 	#include <unistd.h>

uppsrc/Core/Stream.h

@@ -418,14 +418,12 @@ public:
 class FileOut : public FileStream {
 public:
 #ifdef PLATFORM_POSIX
-	bool Open(const char *fn, mode_t acm = 0644)
+	bool Open(const char *fn, mode_t acm = 0644);
-	{ return FileStream::Open(fn, FileStream::CREATE, acm); }
 #endif
 #ifdef PLATFORM_WIN32
-	bool Open(const char *fn)              { return FileStream::Open(fn, FileStream::CREATE|FileStream::NOWRITESHARE); }
+	bool Open(const char *fn);
 #endif
 
-
 	FileOut(const char *fn)                { Open(fn); }
 	FileOut()                              {}
 };