Differential D58246 Diff 186929 lld/trunk/ELF/Filesystem.cpp

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lld/trunk/ELF/Filesystem.cpp

Show First 20 Lines • Show All 52 Lines • ▼ Show 20 Lines	#else
// We cannot just remove path from a different thread because we are now going		// We cannot just remove path from a different thread because we are now going
// to create path as a new file.		// to create path as a new file.
// Instead we open the file and unlink it on this thread. The unlink is fast		// Instead we open the file and unlink it on this thread. The unlink is fast
// since the open fd guarantees that it is not removing the last reference.		// since the open fd guarantees that it is not removing the last reference.
int FD;		int FD;
std::error_code EC = sys::fs::openFileForRead(Path, FD);		std::error_code EC = sys::fs::openFileForRead(Path, FD);
sys::fs::remove(Path);		sys::fs::remove(Path);

		if (EC)
		return;

// close and therefore remove TempPath in background.		// close and therefore remove TempPath in background.
if (!EC)		std::mutex M;
std::thread([=] { ::close(FD); }).detach();		std::condition_variable CV;
		bool Started = false;
		std::thread([&, FD] {
		{
		std::lock_guard<std::mutex> L(M);
		Started = true;
		CV.notify_all();
		}
		::close(FD);
		}).detach();

		// GLIBC 2.26 and earlier have race condition that crashes an entire process
		// if the main thread calls exit(2) while other thread is starting up.
		std::unique_lock<std::mutex> L(M);
		CV.wait(L, [&] { return Started; });
#endif		#endif
}		}

// Simulate file creation to see if Path is writable.		// Simulate file creation to see if Path is writable.
//		//
// Determining whether a file is writable or not is amazingly hard,		// Determining whether a file is writable or not is amazingly hard,
// and after all the only reliable way of doing that is to actually		// and after all the only reliable way of doing that is to actually
// create a file. But we don't want to do that in this function		// create a file. But we don't want to do that in this function
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