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Properly increment waiter count for WinAPI file I/O operations.

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This commit is contained in:
Sönke Ludwig 2017-11-25 16:47:29 +01:00
parent 2e3f145f0f
commit 2d4ccf454d
2 changed files with 15 additions and 2 deletions
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7
source/eventcore/drivers/winapi/core.d
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@ -36,7 +36,11 @@ final class WinAPIEventDriverCore : EventDriverCore {
override size_t waiterCount() { return m_waiterCount + m_timers.pendingCount; }
package void addWaiter() { m_waiterCount++; }
package void removeWaiter() { m_waiterCount--; }
package void removeWaiter()
{
assert(m_waiterCount > 0, "Decrementing waiter count below zero.");
m_waiterCount--;
}
override ExitReason processEvents(Duration timeout = Duration.max)
{
@ -216,6 +220,7 @@ private struct HandleSlot {
package struct FileSlot {
static struct Direction(bool RO) {
OVERLAPPED overlapped;
WinAPIEventDriverCore core;
FileIOCallback callback;
ulong offset;
size_t bytesTransferred;

10
source/eventcore/drivers/winapi/files.d
View file

@ -96,7 +96,9 @@ final class WinAPIEventDriverFiles : EventDriverFiles {
slot.offset = offset;
slot.buffer = buffer;
slot.mode = mode;
slot.core = m_core;
slot.callback = on_write_finish;
m_core.addWaiter();
startIO!(WriteFileEx, true)(h, slot);
}
@ -113,7 +115,9 @@ final class WinAPIEventDriverFiles : EventDriverFiles {
slot.offset = offset;
slot.buffer = buffer;
slot.mode = mode;
slot.core = m_core;
slot.callback = on_read_finish;
m_core.addWaiter();
startIO!(ReadFileEx, false)(h, slot);
}
@ -157,13 +161,15 @@ final class WinAPIEventDriverFiles : EventDriverFiles {
auto nbytes = min(slot.buffer.length, DWORD.max);
if (!() @trusted { return fun(h, &slot.buffer[0], nbytes, &slot.overlapped, &onIOFinished!(fun, RO)); } ()) {
slot.core.removeWaiter();
slot.invokeCallback(IOStatus.error, slot.bytesTransferred);
}
}
private static void cancelIO(bool RO)(HANDLE h, ref FileSlot.Direction!RO slot)
private void cancelIO(bool RO)(HANDLE h, ref FileSlot.Direction!RO slot)
{
if (slot.callback) {
m_core.removeWaiter();
//CancelIoEx(h, &slot.overlapped); // FIXME: currently causes linker errors for DMD due to outdated kernel32.lib files
slot.callback = null;
slot.buffer = null;
@ -185,6 +191,7 @@ final class WinAPIEventDriverFiles : EventDriverFiles {
}
if (error != 0) {
slot.core.removeWaiter();
slot.invokeCallback(IOStatus.error, slot.bytesTransferred + bytes_transferred);
return;
}
@ -193,6 +200,7 @@ final class WinAPIEventDriverFiles : EventDriverFiles {
slot.offset += bytes_transferred;
if (slot.bytesTransferred >= slot.buffer.length || slot.mode != IOMode.all) {
slot.core.removeWaiter();
slot.invokeCallback(IOStatus.ok, slot.bytesTransferred);
} else {
startIO!(fun, RO)(h, slot);