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55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/**
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* @file levent.h
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* @brief Light event synchronization primitive [4.0.0+]
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* @author fincs
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* @copyright libnx Authors
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*/
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#pragma once
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#include "../types.h"
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#include "../result.h"
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#include "svc.h"
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/// User-mode light event structure.
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typedef struct LEvent {
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u32 counter;
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bool autoclear;
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} LEvent;
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/**
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* @brief Initializes a user-mode light event.
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* @param[out] le Pointer to \ref LEvent structure.
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* @param[in] signaled Whether the event starts off in signaled state.
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* @param[in] autoclear Autoclear flag.
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*/
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NX_CONSTEXPR void leventInit(LEvent* le, bool signaled, bool autoclear) {
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le->counter = signaled ? 2 : 0;
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le->autoclear = autoclear;
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}
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/**
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* @brief Waits on a user-mode light event.
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* @param[in] le Pointer to \ref LEvent structure.
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* @param[in] timeout_ns Timeout in nanoseconds (pass UINT64_MAX to wait indefinitely).
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* @return true if wait succeeded, false if wait timed out.
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*/
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bool leventWait(LEvent* le, u64 timeout_ns);
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/**
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* @brief Polls a user-mode light event.
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* @param[in] le Pointer to \ref LEvent structure.
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* @return true if event is signaled, false otherwise.
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*/
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bool leventTryWait(LEvent* le);
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/**
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* @brief Signals a user-mode light event.
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* @param[in] le Pointer to \ref LEvent structure.
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*/
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void leventSignal(LEvent* le);
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/**
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* @brief Clears a user-mode light event.
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* @param[in] le Pointer to \ref LEvent structure.
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*/
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void leventClear(LEvent* le);
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