mono/linux-packaging-mono
0
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Imported Upstream version 5.16.0.100

Browse Source 
Former-commit-id: 38faa55fb9669e35e7d8448b15c25dc447f25767
This commit is contained in:
Xamarin Public Jenkins (auto-signing)
2018-08-07 15:19:03 +00:00
parent 0a9828183b
commit 7d7f676260
4419 changed files with 170950 additions and 90273 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
mcs/class/referencesource/mscorlib/system/threading/SemaphoreSlim.cs
View File

@ -79,6 +79,9 @@ namespace System.Threading
// A pre-completed task with Result==true
private readonly static Task<bool> s_trueTask =
new Task<bool>(false, true, (TaskCreationOptions)InternalTaskOptions.DoNotDispose, default(CancellationToken));
// A pre-completed task with Result==false
private readonly static Task<bool> s_falseTask =
new Task<bool>(false, false, (TaskCreationOptions)InternalTaskOptions.DoNotDispose, default(CancellationToken));
// No maximum constant
private const int NO_MAXIMUM = Int32.MaxValue;
@ -323,6 +326,13 @@ namespace System.Threading
cancellationToken.ThrowIfCancellationRequested();
// Perf: Check the stack timeout parameter before checking the volatile count
if (millisecondsTimeout == 0 && m_currentCount == 0)
{
// Pessimistic fail fast, check volatile count outside lock (only when timeout is zero!)
return false;
}
uint startTime = 0;
if (millisecondsTimeout != Timeout.Infinite && millisecondsTimeout > 0)
{
@ -620,6 +630,11 @@ namespace System.Threading
--m_currentCount;
if (m_waitHandle != null && m_currentCount == 0) m_waitHandle.Reset();
return s_trueTask;
}
else if (millisecondsTimeout == 0)
{
// No counts, if timeout is zero fail fast
return s_falseTask;
}
// If there aren't, create and return a task to the caller.
// The task will be completed either when they've successfully acquired