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90 lines (75 loc) · 3.05 KB
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#include "Queue.h"
#include "AsyncCall.h"
#include <swift/ABI/Executor.h>
#include <swift/Runtime/Concurrency.h>
#include <iostream>
using namespace swift;
static Queue GlobalQueue;
SWIFT_CC(swift)
static void enqueueGlobal(Job *job) {
GlobalQueue.insertJob(job);
}
extern "C" void installTaskEnqueueHook(void) {
swift_task_enqueueGlobal_hook = enqueueGlobal;
}
struct ThickAsyncFunctionContext: HeapObject {
uint32_t ExpectedContextSize;
};
using RunAndBlockSignature =
AsyncSignature<void(HeapObject*), /*throws*/ false>;
struct RunAndBlockContext: AsyncContext {
const void *Function;
HeapObject *FunctionContext;
};
using RunAndBlockCalleeContext =
AsyncCalleeContext<RunAndBlockContext, RunAndBlockSignature>;
/// Second half of the runAndBlock async function.
SWIFT_CC(swiftasync)
static void runAndBlock_finish(AsyncTask *task, ExecutorRef executor,
AsyncContext *_context) {
auto calleeContext = static_cast<RunAndBlockCalleeContext*>(_context);
auto context = popAsyncContext(task, calleeContext);
return context->ResumeParent(task, executor, context);
}
/// First half of the runAndBlock async function.
SWIFT_CC(swiftasync)
static void runAndBlock_start(AsyncTask *task, ExecutorRef executor,
AsyncContext *_context) {
auto callerContext = static_cast<RunAndBlockContext*>(_context);
size_t calleeContextSize;
RunAndBlockSignature::FunctionType *function;
// If the function context is non-null, then the function pointer is
// an ordinary function pointer.
auto functionContext = callerContext->FunctionContext;
if (functionContext) {
function = reinterpret_cast<RunAndBlockSignature::FunctionType*>(
const_cast<void*>(callerContext->Function));
calleeContextSize =
static_cast<ThickAsyncFunctionContext*>(functionContext)
->ExpectedContextSize;
// Otherwise, the function pointer is an async function pointer.
} else {
auto fnPtr = reinterpret_cast<const RunAndBlockSignature::FunctionPointer*>(
callerContext->Function);
function = fnPtr->Function;
calleeContextSize = fnPtr->ExpectedContextSize;
}
auto calleeContext =
pushAsyncContext<RunAndBlockSignature>(task, executor, callerContext,
calleeContextSize,
&runAndBlock_finish,
functionContext);
return function(task, executor, calleeContext);
}
SWIFT_CC(swift)
extern "C" void swift_run_async(const void *function, HeapObject *functionContext) {
auto pair = swift_task_create_f(JobFlags(JobKind::Task,
JobPriority::Default),
/*parent*/ nullptr,
&runAndBlock_start,
sizeof(RunAndBlockContext));
auto context = static_cast<RunAndBlockContext*>(pair.InitialContext);
context->Function = function;
context->FunctionContext = functionContext;
swift_task_enqueueGlobal(pair.Task);
}