48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
#include <mbgl/map/backend_scope.hpp>
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#include <mbgl/map/backend.hpp>
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#include <mbgl/util/thread_local.hpp>
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#include <cassert>
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namespace mbgl {
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static util::ThreadLocal<BackendScope> currentScope;
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BackendScope::BackendScope(Backend& backend_, ScopeType scopeType_)
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: priorScope(currentScope.get()),
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nextScope(nullptr),
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backend(backend_),
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scopeType(scopeType_) {
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if (priorScope) {
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assert(priorScope->nextScope == nullptr);
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priorScope->nextScope = this;
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}
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if (scopeType == ScopeType::Explicit) {
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backend.activate();
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}
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currentScope.set(this);
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}
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BackendScope::~BackendScope() {
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assert(nextScope == nullptr);
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if (priorScope) {
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priorScope->backend.activate();
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currentScope.set(priorScope);
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assert(priorScope->nextScope == this);
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priorScope->nextScope = nullptr;
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} else {
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if (scopeType == ScopeType::Explicit) {
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backend.deactivate();
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}
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currentScope.set(nullptr);
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}
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}
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bool BackendScope::exists() {
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return currentScope.get();
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}
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} // namespace mbgl
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