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node: add fields to support sync

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Sync is enabled when clients need time to move to a new location.
It's a bit like GStreamer preroll after a seek. Clients that need
time, increment the sync_total. Whenever a seek is done, the server
waits in the Starting state until the sync_pending is 0 (or timeout
later).

Improve atomic operations
This commit is contained in:
Wim Taymans 2019-08-28 13:56:23 +02:00
parent 0a15e1f804
commit 84405dae2a
5 changed files with 70 additions and 34 deletions
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32
src/pipewire/private.h
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@ -364,7 +364,17 @@ struct pw_node_activation {
uint32_t segment_master[32]; /* unique id (client id usually) of client
* that will update extra segment info, There
* can be one master for each segment
* bitfield */
* bitfield. 0 means no master for the
* given segment info */
uint64_t sync_timeout;
uint32_t sync_version; /* version updates whenever new sync is
* required */
uint32_t sync_total; /* number of clients that have want to
* explicitly signal when they are ready to
* process the pending segment */
uint32_t sync_pending; /* pending number of clients preparing for
* the current segment */
uint32_t version;
struct pw_node_activation_state state[2]; /* one current state and one next state,
@ -392,11 +402,23 @@ struct pw_node_activation {
} pending;
};
#define SEQ_WRITE(s) __atomic_add_fetch((s), 1, __ATOMIC_SEQ_CST)
#define SEQ_WRITE_SUCCESS(s1,s2) ((s1) + 1 == (s2) && (s2 & 1) == 0)
#define ATOMIC_CAS(v,ov,nv) \
({ \
__typeof__(v) __ov = (ov); \
__atomic_compare_exchange_n(&(v), &__ov, (nv), \
0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
})
#define SEQ_READ(s) __atomic_load_n((s), __ATOMIC_SEQ_CST)
#define SEQ_READ_SUCCESS(s1,s2) ((s1) == (s2) && (s2 & 1) == 0)
#define ATOMIC_DEC(s) __atomic_sub_fetch(&(s), 1, __ATOMIC_SEQ_CST)
#define ATOMIC_INC(s) __atomic_add_fetch(&(s), 1, __ATOMIC_SEQ_CST)
#define ATOMIC_LOAD(s) __atomic_load_n(&(s), __ATOMIC_SEQ_CST)
#define ATOMIC_STORE(s,v) __atomic_store_n(&(s), (v), __ATOMIC_SEQ_CST)
#define SEQ_WRITE(s) ATOMIC_INC(s)
#define SEQ_WRITE_SUCCESS(s1,s2) ((s1) + 1 == (s2) && ((s2) & 1) == 0)
#define SEQ_READ(s) ATOMIC_LOAD(s)
#define SEQ_READ_SUCCESS(s1,s2) ((s1) == (s2) && ((s2) & 1) == 0)
#define pw_node_emit(o,m,v,...) spa_hook_list_call(&o->listener_list, struct pw_node_events, m, v, ##__VA_ARGS__)
#define pw_node_emit_destroy(n) pw_node_emit(n, destroy, 0)