2 * SPDX-License-Identifier: LGPL-2.1-only
4 * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 #include <usterr-signal-safe.h>
13 #include <lttng/ust-clock.h>
14 #include <urcu/system.h>
15 #include <urcu/arch.h>
20 struct lttng_trace_clock
*lttng_trace_clock
;
23 struct lttng_trace_clock user_tc
;
28 int lttng_ust_trace_clock_set_read64_cb(uint64_t (*read64
)(void))
30 if (CMM_LOAD_SHARED(lttng_trace_clock
))
32 user_tc
.read64
= read64
;
36 int lttng_ust_trace_clock_set_freq_cb(uint64_t (*freq
)(void))
38 if (CMM_LOAD_SHARED(lttng_trace_clock
))
44 int lttng_ust_trace_clock_set_uuid_cb(int (*uuid
)(char *uuid
))
46 if (CMM_LOAD_SHARED(lttng_trace_clock
))
52 int lttng_ust_trace_clock_set_name_cb(const char *(*name
)(void))
54 if (CMM_LOAD_SHARED(lttng_trace_clock
))
60 int lttng_ust_trace_clock_set_description_cb(const char *(*description
)(void))
62 if (CMM_LOAD_SHARED(lttng_trace_clock
))
64 user_tc
.description
= description
;
68 int lttng_ust_enable_trace_clock_override(void)
70 if (CMM_LOAD_SHARED(lttng_trace_clock
))
78 if (!user_tc
.description
)
80 /* Use default uuid cb when NULL */
81 cmm_smp_mb(); /* Store callbacks before trace clock */
82 CMM_STORE_SHARED(lttng_trace_clock
, &user_tc
);
86 void lttng_ust_clock_init(void)
89 void (*libinit
)(void);
93 libname
= lttng_ust_getenv("LTTNG_UST_CLOCK_PLUGIN");
96 clock_handle
= dlopen(libname
, RTLD_NOW
);
98 PERROR("Cannot load LTTng UST clock override library %s",
103 libinit
= (void (*)(void)) dlsym(clock_handle
,
104 "lttng_ust_clock_plugin_init");
106 PERROR("Cannot find LTTng UST clock override library %s initialization function lttng_ust_clock_plugin_init()",