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55 lines
2.0 KiB
Objective-C
55 lines
2.0 KiB
Objective-C
@import Foundation.NSDictionary;
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#import "AnyPromise+Private.h"
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#import <libkern/OSAtomic.h>
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@import Foundation.NSError;
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@import Foundation.NSNull;
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#import "PromiseKit.h"
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#import <stdatomic.h>
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/**
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Waits on all provided promises.
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`PMKWhen` rejects as soon as one of the provided promises rejects. `PMKJoin` waits on all provided promises, then rejects if any of those promises rejects, otherwise it fulfills with values from the provided promises.
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- Returns: A new promise that resolves once all the provided promises resolve.
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*/
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AnyPromise *PMKJoin(NSArray *promises) {
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if (promises == nil)
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return [AnyPromise promiseWithValue:[NSError errorWithDomain:PMKErrorDomain code:PMKInvalidUsageError userInfo:@{NSLocalizedDescriptionKey: @"PMKJoin(nil)"}]];
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if (promises.count == 0)
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return [AnyPromise promiseWithValue:promises];
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return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
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NSPointerArray *results = NSPointerArrayMake(promises.count);
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__block atomic_int countdown = promises.count;
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__block BOOL rejected = NO;
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[promises enumerateObjectsUsingBlock:^(AnyPromise *promise, NSUInteger ii, BOOL *stop) {
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[promise __pipe:^(id value) {
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if (IsError(value)) {
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rejected = YES;
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}
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//FIXME surely this isn't thread safe on multiple cores?
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[results replacePointerAtIndex:ii withPointer:(__bridge void *)(value ?: [NSNull null])];
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atomic_fetch_sub_explicit(&countdown, 1, memory_order_relaxed);
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if (countdown == 0) {
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if (!rejected) {
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resolve(results.allObjects);
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} else {
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id userInfo = @{PMKJoinPromisesKey: promises};
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id err = [NSError errorWithDomain:PMKErrorDomain code:PMKJoinError userInfo:userInfo];
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resolve(err);
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}
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}
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}];
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(void) stop;
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}];
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}];
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}
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