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Fix problems with 100% CPU usage, thanks to Tobias Hansen (issue #47).

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Based on the Gernot Frisch idea.
This commit is contained in:
David Capello 2012-03-22 15:07:03 -03:00
parent 25884b0fb7
commit 2ae5fc613b
1 changed files with 15 additions and 0 deletions
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15
src/gui/manager.cpp
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@ -15,6 +15,8 @@
#include <vector> #include <vector>
#include <allegro.h> #include <allegro.h>
#include "base/chrono.h"
#include "base/thread.h"
#include "gui/gui.h" #include "gui/gui.h"
#include "gui/intern.h" #include "gui/intern.h"
@ -255,13 +257,26 @@ void jmanager_free(JWidget widget)
void jmanager_run(JWidget widget) void jmanager_run(JWidget widget)
{ {
base::Chrono chrono;
while (!jlist_empty(widget->children)) { while (!jlist_empty(widget->children)) {
chrono.reset();
if (jmanager_generate_messages(widget)) { if (jmanager_generate_messages(widget)) {
jmanager_dispatch_messages(widget); jmanager_dispatch_messages(widget);
} }
else if (!garbage.empty()) { else if (!garbage.empty()) {
collect_garbage(); collect_garbage();
} }
// If the dispatching of messages was faster than 10 milliseconds,
// it means that the process is not using a lot of CPU, so we can
// wait the difference to cover those 10 milliseconds
// sleeping. With this code we can avoid 100% CPU usage (a
// property of Allegro 4 polling nature).
double elapsedMSecs = chrono.elapsed() * 1000.0;
if (elapsedMSecs > 0.0 && elapsedMSecs < 10.0)
base::this_thread::sleep_for((10.0 - elapsedMSecs) / 1000.0);
} }
} }