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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkTaskGroup_DEFINED
#define SkTaskGroup_DEFINED
#include "SkTypes.h"
struct SkRunnable;
class SkTaskGroup : SkNoncopyable {
public:
// Create one of these in main() to enable SkTaskGroups globally.
struct Enabler : SkNoncopyable {
explicit Enabler(int threads = -1); // Default is system-reported core count.
~Enabler();
};
SkTaskGroup();
~SkTaskGroup() { this->wait(); }
// Add a task to this SkTaskGroup. It will likely run on another thread.
// Neither add() method takes owership of any of its parameters.
void add(SkRunnable*);
template <typename T>
void add(void (*fn)(T*), T* arg) { this->add((void_fn)fn, (void*)arg); }
// Add a batch of N tasks, all calling fn with different arguments.
// Equivalent to a loop over add(fn, arg), but with perhaps less synchronization overhead.
template <typename T>
void batch(void (*fn)(T*), T* args, int N) { this->batch((void_fn)fn, args, N, sizeof(T)); }
// Block until all Tasks previously add()ed to this SkTaskGroup have run.
// You may safely reuse this SkTaskGroup after wait() returns.
void wait();
private:
typedef void(*void_fn)(void*);
void add (void_fn, void* arg);
void batch(void_fn, void* args, int N, size_t stride);
/*atomic*/ int32_t fPending;
};
#endif//SkTaskGroup_DEFINED
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