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For performance or workaround reasons we sometimes have to avoid doing two conflicting operations at the same time, but we can still run any number of non-conflicting operations in parallel. MultiLocker (suggestions for a better class name welcome) blocks the calling thread until there are no threads attempting to run a conflicting operation. Signed-off-by: Zygo Blaxell <bees@furryterror.org>
41 lines
840 B
C++
41 lines
840 B
C++
#ifndef CRUCIBLE_MULTILOCK_H
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#define CRUCIBLE_MULTILOCK_H
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#include <condition_variable>
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#include <map>
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#include <memory>
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#include <mutex>
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#include <string>
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namespace crucible {
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using namespace std;
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class MultiLocker {
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mutex m_mutex;
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condition_variable m_cv;
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map<string, size_t> m_counters;
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class LockHandle {
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const string m_type;
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MultiLocker &m_parent;
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bool m_locked = false;
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void set_locked(bool state);
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public:
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~LockHandle();
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LockHandle(const string &type, MultiLocker &parent);
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friend class MultiLocker;
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};
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friend class LockHandle;
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bool is_lock_available(const string &type);
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void put_lock(const string &type);
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shared_ptr<LockHandle> get_lock_private(const string &type);
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public:
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static shared_ptr<LockHandle> get_lock(const string &type);
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};
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}
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#endif // CRUCIBLE_MULTILOCK_H
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