scrcpy/app/src/util/acksync.h

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#ifndef SC_ACK_SYNC_H
#define SC_ACK_SYNC_H
#include "common.h"
#include "thread.h"
#define SC_SEQUENCE_INVALID 0
/**
* Helper to wait for acknowledgments
*
* In practice, it is used to wait for device clipboard acknowledgement from the
* server before injecting Ctrl+v via AOA HID, in order to avoid pasting the
* content of the old device clipboard (if Ctrl+v was injected before the
* clipboard content was actually set).
*/
struct sc_acksync {
sc_mutex mutex;
sc_cond cond;
bool stopped;
// Last acked value, initially SC_SEQUENCE_INVALID
uint64_t ack;
};
enum sc_acksync_wait_result {
// Acknowledgment received
SC_ACKSYNC_WAIT_OK,
// Timeout expired
SC_ACKSYNC_WAIT_TIMEOUT,
// Interrupted from another thread by sc_acksync_interrupt()
SC_ACKSYNC_WAIT_INTR,
};
bool
sc_acksync_init(struct sc_acksync *as);
void
sc_acksync_destroy(struct sc_acksync *as);
/**
* Acknowledge `sequence`
*
* The `sequence` must be greater than (or equal to) any previous acknowledged
* sequence.
*/
void
sc_acksync_ack(struct sc_acksync *as, uint64_t sequence);
/**
* Wait for acknowledgment of sequence `ack` (or higher)
*/
enum sc_acksync_wait_result
sc_acksync_wait(struct sc_acksync *as, uint64_t ack, sc_tick deadline);
/**
* Interrupt any `sc_acksync_wait()`
*/
void
sc_acksync_interrupt(struct sc_acksync *as);
#endif