Remove some code churn.

llvm-svn: 211068

Remove some more code out into a separate CL.

llvm-svn: 211067

Users of the llvm global mutex must now acquire it manually.

This allows the mutex to be acquired in a guarded, RAII fashion.

llvm-svn: 211066

Revert "Remove support for runtime multi-threading."

This reverts revision r210600.

llvm-svn: 210603

Remove support for runtime multi-threading.

This patch removes the functions llvm_start_multithreaded() and
llvm_stop_multithreaded(), and changes llvm_is_multithreaded()
to return a constant value

Remove support for runtime multi-threading.

This patch removes the functions llvm_start_multithreaded() and
llvm_stop_multithreaded(), and changes llvm_is_multithreaded()
to return a constant value based on the value of the compile-time
definition LLVM_ENABLE_THREADS.

Previously, it was possible to have compile-time support for
threads on, and runtime support for threads off, in which case
certain mutexes were not allocated or ever acquired. Now, if the
build is created with threads enabled, mutexes are always acquired.

A test before/after patch of compiling a very large TU showed no
noticeable performance impact of this change.

Reviewers: rnk

Differential Revision: http://reviews.llvm.org/D4076

llvm-svn: 210600

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ManagedStatic is never built with a null constructor, remove support for it.

llvm-svn: 206492

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

llvm-svn: 206252

[C++11] Replace some comparisons with 'nullptr' with simple boolean checks to reduce verbosity.

llvm-svn: 205829

[C++11] Make use of 'nullptr' in the Support library.

llvm-svn: 205697

Revert "[C++11] Replace LLVM atomics with std::atomic."

Breaks the MSVC build.
DataStream.cpp(44): error C2552: 'llvm::Statistic::Value' : non-aggregates cannot be initialized with initializer list

Revert "[C++11] Replace LLVM atomics with std::atomic."

Breaks the MSVC build.
DataStream.cpp(44): error C2552: 'llvm::Statistic::Value' : non-aggregates cannot be initialized with initializer list

llvm-svn: 202731

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[C++11] Replace LLVM atomics with std::atomic.

With C++11 we finally have a standardized way to specify atomic operations. Use
them to replace the existing custom implemention. Sadly the translation

[C++11] Replace LLVM atomics with std::atomic.

With C++11 we finally have a standardized way to specify atomic operations. Use
them to replace the existing custom implemention. Sadly the translation is not
entirely trivial as std::atomic allows more fine-grained control over the
atomicity. I tried to preserve the old semantics as well as possible.

Differential Revision: http://llvm-reviews.chandlerc.com/D2915

llvm-svn: 202730

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Add support for tsan annotations (thread sanitizer, a valgrind-based tool).
These annotations are disabled entirely when either ENABLE_THREADS is off, or
building a release build. When enabled, they

Add support for tsan annotations (thread sanitizer, a valgrind-based tool).
These annotations are disabled entirely when either ENABLE_THREADS is off, or
building a release build. When enabled, they add calls to functions with no
statements to ManagedStatic's getters.

Use these annotations to inform tsan that the race used inside ManagedStatic
initialization is actually benign. Thanks to Kostya Serebryany for helping
write this patch!

llvm-svn: 144567

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Merge System into Support.

llvm-svn: 120298

Split the thread-related APIs out into their own file, and add a few more
calls for convenience.

llvm-svn: 73512

Untabification.

llvm-svn: 72604

Have llvm_start_multithreaded return a bool indicating whether multithreaded
initialization succeeded or not, rather than just asserting.

llvm-svn: 72182

Add llvm_start_multithreaded(), which starts up the LLVM internals in thread-safe mode. Provide double-check locking
initialization of ManagedStatic's when running in thread-safe mode.

llvm-svn: 72

Add llvm_start_multithreaded(), which starts up the LLVM internals in thread-safe mode. Provide double-check locking
initialization of ManagedStatic's when running in thread-safe mode.

llvm-svn: 72151

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Remove attribution from file headers, per discussion on llvmdev.

llvm-svn: 45418

Not all managedstatics need object pointers.

llvm-svn: 34444

Define this in the correct n/s

llvm-svn: 30671

new helper class to provide more explicit management of static ctor/dtors.

llvm-svn: 30638