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[orbis-kernel] Hopefully fix shared_cv

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This commit is contained in:
Ivan Chikish 2023-07-07 13:49:59 +03:00
parent 99f520491c
commit 3d78443496
4 changed files with 62 additions and 29 deletions
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4
orbis-kernel/include/orbis/utils/SharedCV.hpp
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@ -10,7 +10,9 @@ inline namespace utils {
class shared_cv {
enum : unsigned {
c_waiter_mask = 0xffff,
c_signal_mask = 0xffffffff & ~c_waiter_mask,
c_signal_mask = 0x7fff0000,
c_locked_mask = 0x80000000,
c_signal_one = c_waiter_mask + 1,
};
std::atomic<unsigned> m_value{0};

7
orbis-kernel/include/orbis/utils/SharedMutex.hpp
View file

@ -7,7 +7,9 @@
namespace orbis {
inline namespace utils {
// IPC-ready shared mutex, using only writer lock is recommended
struct shared_mutex final {
class shared_mutex final {
friend class shared_cv;
enum : unsigned {
c_one = 1u << 14, // Fixed-point 1.0 value (one writer)
c_sig = 1u << 30,
@ -102,8 +104,9 @@ public:
// Check whether can immediately obtain a shared (reader) lock
bool is_lockable() const { return m_value.load() < c_one - 1; }
private:
// For CV
unsigned lock_forced();
bool lock_forced(int count = 1);
};
// Simplified shared (reader) lock implementation.