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Explicitly set Windows Process Scheduling Class

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Robin Gareus 2024-09-30 19:57:53 +02:00
parent ed437afda7
commit dab22a7c70
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1 changed files with 61 additions and 0 deletions
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61
libs/pbd/pthread_utils.cc
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@ -23,6 +23,10 @@
#include <stdint.h>
#include <string>
#ifdef PLATFORM_WINDOWS
#include <windows.h>
#endif
#if !defined PLATFORM_WINDOWS && defined __GLIBC__
#include <climits>
#include <dlfcn.h>
@ -55,6 +59,49 @@ static pthread_mutex_t thread_map_lock = PTHREAD_MUTEX_INITIAL
static Glib::Threads::Private<char> thread_name (free);
static int base_priority_relative_to_max = -20;
#ifdef PLATFORM_WINDOWS
static
std::string GetLastErrorAsString()
{
DWORD err = ::GetLastError();
if(err == 0) {
return std::string ();
}
LPSTR buf = nullptr;
size_t size = FormatMessageA (FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, err, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&buf, 0, NULL);
std::string rv (buf, size);
LocalFree (buf);
return rv;
}
static bool
set_win_set_realtime_policy (pthread_t thread, int priority)
{
if (priority < 12) {
return false;
}
bool ok = false;
if (SetPriorityClass (GetCurrentProcess (), 0x00000100 /* REALTIME_PRIORITY_CLASS */)) {
/* see https://learn.microsoft.com/en-us/windows/win32/procthread/scheduling-priorities */
ok = SetThreadPriority (pthread_gethandle (thread), priority);
DEBUG_TRACE (PBD::DEBUG::Threads, string_compose ("Using Windows RT thread class. set priority: %1\n", ok ? "OK" : GetLastErrorAsString ()));
} else {
DEBUG_TRACE (PBD::DEBUG::Threads, string_compose ("Cannot use Windows RT thread class: %1\n", GetLastErrorAsString ()));
ok = SetPriorityClass (GetCurrentProcess (), 0x00000080 /* HIGH_PRIORITY_CLASS */);
DEBUG_TRACE (PBD::DEBUG::Threads, string_compose ("Using Windows high priority thread class: %1\n", ok ? "OK" : GetLastErrorAsString ()));
if (ok) {
ok = SetThreadPriority (pthread_gethandle (thread), priority);
DEBUG_TRACE (PBD::DEBUG::Threads, string_compose ("Set Windows high thread priority: %1\n", ok ? "OK" : GetLastErrorAsString ()));
}
}
return ok;
}
#endif
namespace PBD
{
PBD::Signal3<void, pthread_t, std::string, uint32_t> ThreadCreatedWithRequestSize;
@ -370,6 +417,12 @@ pbd_realtime_pthread_create (
DEBUG_TRACE (PBD::DEBUG::Threads, string_compose ("Start Realtime Thread policy = %1 priority = %2 stacksize = 0x%3%4\n", policy, parm.sched_priority, std::hex, stacksize));
rv = pthread_create (thread, &attr, start_routine, arg);
pthread_attr_destroy (&attr);
#ifdef PLATFORM_WINDOWS
if (0 == rv && thread && parm.sched_priority >= 12) {
set_win_set_realtime_policy (*thread, parm.sched_priority);
}
#endif
return rv;
}
@ -386,6 +439,14 @@ pbd_set_thread_priority (pthread_t thread, int policy, int priority)
DEBUG_TRACE (PBD::DEBUG::Threads, string_compose ("Change '%1' to policy = %2 priority = %3\n", pthread_name(), policy, param.sched_priority));
#ifdef PLATFORM_WINDOWS
if (thread && param.sched_priority >= 12) {
if (set_win_set_realtime_policy (thread, param.sched_priority)) {
return 0;
}
}
#endif
return pthread_setschedparam (thread, SCHED_FIFO, &param);
}