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#ifndef MBGL_STORAGE_DEFAULT_THREAD_CONTEXT
#define MBGL_STORAGE_DEFAULT_THREAD_CONTEXT
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/util/std.hpp>
#include <mbgl/util/util.hpp>
#include <mbgl/util/uv.hpp>
#include <uv.h>
#include <pthread.h>
#include <map>
#include <cassert>
namespace mbgl {
// This is a template class that provides a per-thread and per-loop Context object. It can be used
// by implementations to store global state.
template <typename Context>
class ThreadContext : private util::noncopyable {
protected:
MBGL_STORE_THREAD(tid)
using Map = std::map<uv_loop_t *, std::unique_ptr<Context>>;
public:
static Context *Get(uv_loop_t *loop);
private:
static pthread_key_t key;
static pthread_once_t once;
public:
ThreadContext(uv_loop_t *loop);
~ThreadContext();
public:
uv_loop_t *loop;
};
template <typename Context>
Context *ThreadContext<Context>::Get(uv_loop_t *loop) {
pthread_once(&once, []() {
pthread_key_create(&key, [](void *ptr) {
assert(ptr);
delete reinterpret_cast<Map *>(ptr);
});
});
auto contexts = reinterpret_cast<Map *>(pthread_getspecific(key));
if (!contexts) {
contexts = new Map();
pthread_setspecific(key, contexts);
}
// Now find a ThreadContext that matches the requested loop.
auto it = contexts->find(loop);
if (it == contexts->end()) {
auto result = contexts->emplace(loop, util::make_unique<Context>(loop));
assert(result.second); // Make sure it was actually inserted.
return result.first->second.get();
} else {
return it->second.get();
}
}
template <typename Context>
ThreadContext<Context>::ThreadContext(uv_loop_t *loop_) : loop(loop_) {
}
template <typename Context>
ThreadContext<Context>::~ThreadContext() {
MBGL_VERIFY_THREAD(tid);
}
}
#endif
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