/
Coroutine.m
221 lines (183 loc) · 3.55 KB
/
Coroutine.m
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//
// Coroutine.m
// CoroutineKit
//
// Created by Steve Dekorte on 20110830.
// Copyright 2011 Steve Dekorte. BSD licensed.
#import "Coroutine.h"
@implementation Coroutine
static Coroutine *mainCoroutine = nil;
static Coroutine *currentCoroutine = nil;
@synthesize target;
@synthesize action;
@synthesize hasStarted;
@synthesize next;
@synthesize previous;
@synthesize waitingOnFuture;
static long activeCoroutineCount = 0;
static NSTimer *activeCoroutineTimer = nil;
+ (void)incrementActiveCoroutineCount
{
activeCoroutineCount ++;
if(!activeCoroutineTimer)
{
activeCoroutineTimer = [NSTimer timerWithTimeInterval:1.0/30.0
target:mainCoroutine
selector:@selector(timer:)
userInfo:nil
repeats:YES];
[activeCoroutineTimer retain];
}
if([activeCoroutineTimer isValid])
{
[activeCoroutineTimer fire];
}
}
+ (void)decrementActiveCoroutineCount
{
activeCoroutineCount --;
if(activeCoroutineCount == 0 && [activeCoroutineTimer isValid])
{
[activeCoroutineTimer invalidate];
}
}
- (void)timer:userInfo
{
[mainCoroutine yield];
}
- (Coro *)coro
{
return coro;
}
+ (Coroutine *)currentCoroutine
{
return currentCoroutine;
}
+ (Coroutine *)mainCoroutine
{
if(!mainCoroutine)
{
mainCoroutine = [Coroutine alloc];
Coro_initializeMainCoro([mainCoroutine coro]);
[mainCoroutine setNext:mainCoroutine];
[mainCoroutine setPrevious:mainCoroutine];
currentCoroutine = mainCoroutine;
}
return mainCoroutine;
}
- (id)init
{
self = [super init];
if (self)
{
[Coroutine mainCoroutine];
coro = Coro_new();
}
[[self class] incrementActiveCoroutineCount];
return self;
}
- (void)dealloc
{
[[self class] decrementActiveCoroutineCount];
Coro_free(coro);
[super dealloc];
}
- (size_t)stackSize
{
return Coro_stackSize(coro);
}
- (void)setStackSize:(size_t)size
{
Coro_setStackSize_(coro, size);
}
- (size_t)bytesLeftOnStack
{
return Coro_bytesLeftOnStack(coro);
}
//typedef void (CoroStartCallback)(void *);
- (void)startup
{
[target performSelector:action];
}
static void callback(void *aCoroutine)
{
Coroutine *self = (Coroutine *)aCoroutine;
[self startup];
}
- (void)start
{
if(hasStarted)
{
hasStarted = YES;
Coroutine *lastCoroutine = currentCoroutine;
currentCoroutine = self;
Coro_startCoro_([lastCoroutine coro], [self coro], (void *)self, callback);
}
else
{
[NSException raise:@"Coroutine" format:@"attempt to start a Coroutine twice"];
}
}
- (void)resume
{
if(!hasStarted)
{
[self start];
}
else
{
Coroutine *lastCoroutine = currentCoroutine;
currentCoroutine = self;
Coro_switchTo_([lastCoroutine coro], [self coro]);
}
}
- (void)remove
{
[previous setNext:next];
[self setNext:nil];
[self setPrevious:nil];
}
- (void)insertFirst:(Coroutine *)aCoroutine
{
if(aCoroutine == self) return;
[aCoroutine remove];
[aCoroutine setNext:next];
[aCoroutine setPrevious:self];
[next setPrevious:aCoroutine];
[self setNext:aCoroutine];
}
- (void)insertLast:(Coroutine *)aCoroutine
{
if(aCoroutine == self) return;
[aCoroutine remove];
[aCoroutine setNext:self];
[aCoroutine setPrevious:previous];
[previous setNext:aCoroutine];
[self setPrevious:aCoroutine];
}
- (void)scheduleFirst
{
[currentCoroutine insertFirst:self];
}
- (void)scheduleLast
{
[currentCoroutine insertLast:self];
}
- (void)yield
{
[[currentCoroutine next] resume];
}
- (void)unschedule
{
if(currentCoroutine == self)
{
Coroutine *nextCoroutine = [self next];
[self remove];
[nextCoroutine resume];
}
else
{
[self remove];
}
}
@end