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osx: disable app-nap during serial comm (#687)

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Apple introduced app-nap with OS X 10.10. This feature
saves power by throttling apps running in background.
However, it also less accurate timers in systemcalls. In
our case a 30ms select timeout would take up to 10s.

This patch uses an API also added with 10.10 to disable
app-nap as long as the serial port is polled.
This commit is contained in:
AntiCat 2018-10-08 07:15:29 +02:00 • committed by pwpiwi
commit 2a53731106
5 changed files with 80 additions and 5 deletions
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40
client/util_darwin.m Normal file
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//-----------------------------------------------------------------------------
// (c) 2018 AntiCat
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// macOS framework bindings
//-----------------------------------------------------------------------------
#import "util_darwin.h"
#import <Foundation/NSString.h>
#import <Foundation/NSProcessInfo.h>
static id activity = nil;
//OS X Version 10.10 is defined in OS X 10.10 and later
#if defined(MAC_OS_X_VERSION_10_10)
void disableAppNap(const char* reason) {
if(activity == nil) {
//NSLog(@"disableAppNap: %@", @(reason));
activity = [[NSProcessInfo processInfo] beginActivityWithOptions:NSActivityBackground reason:@(reason)];
[activity retain];
}
}
void enableAppNap() {
if(activity != nil) {
//NSLog(@"enableAppNap");
[[NSProcessInfo processInfo] endActivity:activity];
[activity release];
activity = nil;
}
}
#else
void disableAppNap(const char* reason) { }
void enableAppNap() { }
#endif