SWDEV-306410 - Remove program lock

Remove global program lock in order to fix too
long kernel launch overhead with multi-threads
on MGPUs.
This patch depends on a compiler patch that makes
LC thread safe.
Change-Id: Ic8a7374d19112764d6de5d483ec5d07a56661d1b

rocclr/platform/program.cpp

@@ -227,8 +227,6 @@ device::Program* Program::getDeviceProgram(const Device& device) const {
   return it->second;
 }
 
-Monitor Program::buildLock_("OCL build program", true);
-
 static bool adjustOptionsOnIgnoreEnv(std::string &cppstr) {
   // if there is a -ignore-env,  adjust options.
   bool optionChangable = true;
@@ -250,8 +248,6 @@ int32_t Program::compile(const std::vector<Device*>& devices, size_t numHeaders,
                         const char** headerIncludeNames, const char* options,
                         void(CL_CALLBACK* notifyFptr)(cl_program, void*), void* data,
                         bool optionChangable) {
-  ScopedLock sl(buildLock_);
-
   int32_t retval = CL_SUCCESS;
 
   // Clear the program object
@@ -321,7 +317,6 @@ int32_t Program::link(const std::vector<Device*>& devices, size_t numInputs,
                      const std::vector<Program*>& inputPrograms, const char* options,
                      void(CL_CALLBACK* notifyFptr)(cl_program, void*), void* data,
                      bool optionChangable) {
-  ScopedLock sl(buildLock_);
   int32_t retval = CL_SUCCESS;
 
   if (symbolTable_ == NULL) {
@@ -489,7 +484,6 @@ void Program::StubProgramSource(const std::string& app_name) {
 int32_t Program::build(const std::vector<Device*>& devices, const char* options,
                       void(CL_CALLBACK* notifyFptr)(cl_program, void*), void* data,
                       bool optionChangable, bool newDevProg) {
-  ScopedLock sl(buildLock_);
   int32_t retval = CL_SUCCESS;
 
   if (symbolTable_ == NULL) {
@@ -596,8 +590,6 @@ int32_t Program::build(const std::vector<Device*>& devices, const char* options,
 }
 
 bool Program::load(const std::vector<Device*>& devices) {
-  ScopedLock sl(buildLock_);
-
   for (const auto& it : devicePrograms_) {
     const Device& device = *(it.first);
 

rocclr/platform/program.hpp

@@ -126,9 +126,6 @@ class Program : public RuntimeObject {
   //! Clears the program object if the app attempts to rebuild the program
   void clear();
 
-  //! Global build lock (remove when LLVM is thread-safe).
-  static Monitor buildLock_;
-
  public:
   //! Construct a new program to be compiled from the given source code.
   Program(Context& context, const std::string& sourceCode, Language language,