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/* -----------------------------------------------------------------------------
 *
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 * (c) The GHC Team, 2008-2009
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 *
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 * Support for fast binary event logging and user-space dtrace probes.
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 *
 * ---------------------------------------------------------------------------*/

#ifndef TRACE_H
#define TRACE_H

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#include "rts/EventLogFormat.h"
#include "Capability.h"

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#if defined(DTRACE)
#include "RtsProbes.h"
#endif /* defined(DTRACE) */

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#include "BeginPrivate.h"
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// -----------------------------------------------------------------------------
// EventLog API
// -----------------------------------------------------------------------------
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#if defined(TRACING)
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void initTracing (void);
void endTracing  (void);
void freeTracing (void);
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void resetTracing (void);
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#endif /* TRACING */
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typedef StgWord32 CapsetID;
typedef StgWord16 CapsetType;
enum CapsetType { CapsetTypeCustom = CAPSET_TYPE_CUSTOM,
                  CapsetTypeOsProcess = CAPSET_TYPE_OSPROCESS,
                  CapsetTypeClockdomain = CAPSET_TYPE_CLOCKDOMAIN };
#define CAPSET_OSPROCESS_DEFAULT 0
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#define CAPSET_CLOCKDOMAIN_DEFAULT 1
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// -----------------------------------------------------------------------------
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// Message classes
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// -----------------------------------------------------------------------------

// debugging flags, set with +RTS -D<something>
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extern int DEBUG_sched;
extern int DEBUG_interp;
extern int DEBUG_weak;
extern int DEBUG_gccafs;
extern int DEBUG_gc;
extern int DEBUG_block_alloc;
extern int DEBUG_sanity;
extern int DEBUG_stable;
extern int DEBUG_stm;
extern int DEBUG_prof;
extern int DEBUG_gran;
extern int DEBUG_par;
extern int DEBUG_linker;
extern int DEBUG_squeeze;
extern int DEBUG_hpc;
extern int DEBUG_sparks;
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// events
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extern int TRACE_sched;
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extern int TRACE_gc;
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extern int TRACE_spark_sampled;
extern int TRACE_spark_full;
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/* extern int TRACE_user; */  // only used in Trace.c
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// -----------------------------------------------------------------------------
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// Posting events
//
// We use macros rather than inline functions deliberately.  We want
// the not-taken case to be as efficient as possible, a simple
// test-and-jump, and with inline functions gcc seemed to move some of
// the instructions from the branch up before the test.
// 
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// -----------------------------------------------------------------------------

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#ifdef DEBUG
void traceBegin (const char *str, ...);
void traceEnd (void);
#endif
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#ifdef TRACING
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/* 
 * Record a scheduler event
 */
#define traceSchedEvent(cap, tag, tso, other)   \
    if (RTS_UNLIKELY(TRACE_sched)) {            \
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        traceSchedEvent_(cap, tag, tso, other, 0); \
    }

#define traceSchedEvent2(cap, tag, tso, info1, info2) \
    if (RTS_UNLIKELY(TRACE_sched)) {            \
        traceSchedEvent_(cap, tag, tso, info1, info2); \
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    }
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void traceSchedEvent_ (Capability *cap, EventTypeNum tag, 
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                       StgTSO *tso, StgWord info1, StgWord info2);
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/* 
 * Record a GC event
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 */
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#define traceGcEvent(cap, tag)    \
    if (RTS_UNLIKELY(TRACE_gc)) { \
        traceGcEvent_(cap, tag);  \
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    }

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void traceGcEvent_ (Capability *cap, EventTypeNum tag);
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/* 
 * Record a spark event
 */
#define traceSparkEvent(cap, tag)         \
    if (RTS_UNLIKELY(TRACE_spark_full)) { \
        traceSparkEvent_(cap, tag, 0);    \
    }

#define traceSparkEvent2(cap, tag, other)  \
    if (RTS_UNLIKELY(TRACE_spark_full)) {  \
        traceSparkEvent_(cap, tag, other); \
    }

void traceSparkEvent_ (Capability *cap, EventTypeNum tag, StgWord info1);

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// variadic macros are C99, and supported by gcc.  However, the
// ##__VA_ARGS syntax is a gcc extension, which allows the variable
// argument list to be empty (see gcc docs for details).

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/* 
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 * Emit a trace message on a particular Capability
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 */
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#define traceCap(class, cap, msg, ...)          \
    if (RTS_UNLIKELY(class)) {                  \
        traceCap_(cap, msg, ##__VA_ARGS__);     \
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    }

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void traceCap_(Capability *cap, char *msg, ...);
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/* 
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 * Emit a trace message
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 */
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#define trace(class, msg, ...)                  \
    if (RTS_UNLIKELY(class)) {                  \
        trace_(msg, ##__VA_ARGS__);             \
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    }

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void trace_(char *msg, ...);
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/* 
 * A message or event emitted by the program
 */
void traceUserMsg(Capability *cap, char *msg);

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/* 
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 * Emit a debug message (only when DEBUG is defined)
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 */
#ifdef DEBUG
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#define debugTrace(class, msg, ...)             \
    if (RTS_UNLIKELY(class)) {                  \
        trace_(msg, ##__VA_ARGS__);             \
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    }
#else
#define debugTrace(class, str, ...) /* nothing */
#endif

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#ifdef DEBUG
#define debugTraceCap(class, cap, msg, ...)      \
    if (RTS_UNLIKELY(class)) {                  \
        traceCap_(cap, msg, ##__VA_ARGS__);     \
    }
#else
#define debugTraceCap(class, cap, str, ...) /* nothing */
#endif

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/* 
 * Emit a message/event describing the state of a thread
 */
#define traceThreadStatus(class, tso)           \
    if (RTS_UNLIKELY(class)) {                  \
        traceThreadStatus_(tso);                \
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    }

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void traceThreadStatus_ (StgTSO *tso);
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void traceEventStartup_ (int n_caps);

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/*
 * Events for describing capability sets in the eventlog
 *
 * Note: unlike other events, these are not conditional on TRACE_sched or
 * similar because they are not "real" events themselves but provide
 * information and context for other "real" events. Other events depend on
 * the capset info events so for simplicity, rather than working out if
 * they're necessary we always emit them. They should be very low volume.
 */
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void traceCapsetEvent_ (EventTypeNum tag,
                        CapsetID capset,
                        StgWord info);
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void traceWallClockTime_(void);

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void traceOSProcessInfo_ (void);

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void traceSparkCounters_ (Capability *cap,
                          SparkCounters counters,
                          StgWord remaining);

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#else /* !TRACING */
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#define traceSchedEvent(cap, tag, tso, other) /* nothing */
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#define traceSchedEvent2(cap, tag, tso, other, info) /* nothing */
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#define traceGcEvent(cap, tag) /* nothing */
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#define traceSparkEvent(cap, tag) /* nothing */
#define traceSparkEvent2(cap, tag, other) /* nothing */
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#define traceCap(class, cap, msg, ...) /* nothing */
#define trace(class, msg, ...) /* nothing */
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#define debugTrace(class, str, ...) /* nothing */
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#define debugTraceCap(class, cap, str, ...) /* nothing */
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#define traceThreadStatus(class, tso) /* nothing */
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INLINE_HEADER void traceEventStartup_ (int n_caps STG_UNUSED) {};
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#define traceCapsetEvent_(tag, capset, info) /* nothing */
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#define traceWallClockTime_() /* nothing */
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#define traceOSProcessInfo_() /* nothing */
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#define traceSparkCounters_(cap, counters, remaining) /* nothing */
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#endif /* TRACING */
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// If DTRACE is enabled, but neither DEBUG nor TRACING, we need a C land
// wrapper for the user-msg probe (as we can't expand that in PrimOps.cmm)
//
#if !defined(DEBUG) && !defined(TRACING) && defined(DTRACE)

void dtraceUserMsgWrapper(Capability *cap, char *msg);

#endif /* !defined(DEBUG) && !defined(TRACING) && defined(DTRACE) */

// -----------------------------------------------------------------------------
// Aliases for static dtrace probes if dtrace is available
// -----------------------------------------------------------------------------

#if defined(DTRACE)

#define dtraceCreateThread(cap, tid)                    \
    HASKELLEVENT_CREATE_THREAD(cap, tid)
#define dtraceRunThread(cap, tid)                       \
    HASKELLEVENT_RUN_THREAD(cap, tid)
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#define dtraceStopThread(cap, tid, status, info)        \
    HASKELLEVENT_STOP_THREAD(cap, tid, status, info)
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#define dtraceThreadRunnable(cap, tid)                  \
    HASKELLEVENT_THREAD_RUNNABLE(cap, tid)
#define dtraceMigrateThread(cap, tid, new_cap)          \
    HASKELLEVENT_MIGRATE_THREAD(cap, tid, new_cap)
#define dtraceShutdown(cap)                             \
    HASKELLEVENT_SHUTDOWN(cap)
#define dtraceThreadWakeup(cap, tid, other_cap)         \
    HASKELLEVENT_THREAD_WAKEUP(cap, tid, other_cap)
#define dtraceGcStart(cap)                              \
    HASKELLEVENT_GC_START(cap)
#define dtraceGcEnd(cap)                                \
    HASKELLEVENT_GC_END(cap)
#define dtraceRequestSeqGc(cap)                         \
    HASKELLEVENT_REQUEST_SEQ_GC(cap)
#define dtraceRequestParGc(cap)                         \
    HASKELLEVENT_REQUEST_PAR_GC(cap)
#define dtraceCreateSparkThread(cap, spark_tid)         \
    HASKELLEVENT_CREATE_SPARK_THREAD(cap, spark_tid)
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INLINE_HEADER void dtraceStartup (int num_caps) {
    HASKELLEVENT_STARTUP(num_caps);
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}
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#define dtraceUserMsg(cap, msg)                         \
    HASKELLEVENT_USER_MSG(cap, msg)
#define dtraceGcIdle(cap)                               \
    HASKELLEVENT_GC_IDLE(cap)
#define dtraceGcWork(cap)                               \
    HASKELLEVENT_GC_WORK(cap)
#define dtraceGcDone(cap)                               \
    HASKELLEVENT_GC_DONE(cap)
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#define dtraceCapsetCreate(capset, capset_type)         \
    HASKELLEVENT_CAPSET_CREATE(capset, capset_type)
#define dtraceCapsetDelete(capset)                      \
    HASKELLEVENT_CAPSET_DELETE(capset)
#define dtraceCapsetAssignCap(capset, capno)            \
    HASKELLEVENT_CAPSET_ASSIGN_CAP(capset, capno)
#define dtraceCapsetRemoveCap(capset, capno)            \
    HASKELLEVENT_CAPSET_REMOVE_CAP(capset, capno)
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#define dtraceSparkCounters(cap, a, b, c, d, e, f, g) \
    HASKELLEVENT_SPARK_COUNTERS(cap, a, b, c, d, e, f, g)
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#define dtraceSparkCreate(cap)                         \
    HASKELLEVENT_SPARK_CREATE(cap)
#define dtraceSparkDud(cap)                             \
    HASKELLEVENT_SPARK_DUD(cap)
#define dtraceSparkOverflow(cap)                        \
    HASKELLEVENT_SPARK_OVERFLOW(cap)
#define dtraceSparkRun(cap)                             \
    HASKELLEVENT_SPARK_RUN(cap)
#define dtraceSparkSteal(cap, victim_cap)               \
    HASKELLEVENT_SPARK_STEAL(cap, victim_cap)
#define dtraceSparkFizzle(cap)                          \
    HASKELLEVENT_SPARK_FIZZLE(cap)
#define dtraceSparkGc(cap)                              \
    HASKELLEVENT_SPARK_GC(cap)
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#else /* !defined(DTRACE) */

#define dtraceCreateThread(cap, tid)                    /* nothing */
#define dtraceRunThread(cap, tid)                       /* nothing */
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#define dtraceStopThread(cap, tid, status, info)        /* nothing */
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#define dtraceThreadRunnable(cap, tid)                  /* nothing */
#define dtraceMigrateThread(cap, tid, new_cap)          /* nothing */
#define dtraceShutdown(cap)                             /* nothing */
#define dtraceThreadWakeup(cap, tid, other_cap)         /* nothing */
#define dtraceGcStart(cap)                              /* nothing */
#define dtraceGcEnd(cap)                                /* nothing */
#define dtraceRequestSeqGc(cap)                         /* nothing */
#define dtraceRequestParGc(cap)                         /* nothing */
#define dtraceCreateSparkThread(cap, spark_tid)         /* nothing */
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INLINE_HEADER void dtraceStartup (int num_caps STG_UNUSED) {};
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#define dtraceUserMsg(cap, msg)                         /* nothing */
#define dtraceGcIdle(cap)                               /* nothing */
#define dtraceGcWork(cap)                               /* nothing */
#define dtraceGcDone(cap)                               /* nothing */
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#define dtraceCapsetCreate(capset, capset_type)         /* nothing */
#define dtraceCapsetDelete(capset)                      /* nothing */
#define dtraceCapsetAssignCap(capset, capno)            /* nothing */
#define dtraceCapsetRemoveCap(capset, capno)            /* nothing */
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#define dtraceSparkCounters(cap, a, b, c, d, e, f, g)   /* nothing */
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#define dtraceSparkCreate(cap)                          /* nothing */
#define dtraceSparkDud(cap)                             /* nothing */
#define dtraceSparkOverflow(cap)                        /* nothing */
#define dtraceSparkRun(cap)                             /* nothing */
#define dtraceSparkSteal(cap, victim_cap)               /* nothing */
#define dtraceSparkFizzle(cap)                          /* nothing */
#define dtraceSparkGc(cap)                              /* nothing */
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#endif

// -----------------------------------------------------------------------------
// Trace probes dispatching to various tracing frameworks
//
// In order to avoid accumulating multiple calls to tracing calls at trace
// points, we define inline probe functions that contain the various
// invocations.
//
// Dtrace - dtrace probes are unconditionally added as probe activation is
//   handled by the dtrace component of the kernel, and inactive probes are
//   very cheap — usually, one no-op.  Consequently, dtrace can be used with
//   all flavours of the RTS.  In addition, we still support logging events to
//   a file, even in the presence of dtrace.  This is, eg, useful when tracing
//   on a server, but browsing trace information with ThreadScope on a local
//   client.
// 
// -----------------------------------------------------------------------------

INLINE_HEADER void traceEventCreateThread(Capability *cap STG_UNUSED, 
                                          StgTSO     *tso STG_UNUSED)
{
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    traceSchedEvent(cap, EVENT_CREATE_THREAD, tso, tso->stackobj->stack_size);
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    dtraceCreateThread((EventCapNo)cap->no, (EventThreadID)tso->id);
}

INLINE_HEADER void traceEventRunThread(Capability *cap STG_UNUSED, 
                                       StgTSO     *tso STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_RUN_THREAD, tso, tso->what_next);
    dtraceRunThread((EventCapNo)cap->no, (EventThreadID)tso->id);
}

INLINE_HEADER void traceEventStopThread(Capability          *cap    STG_UNUSED, 
                                        StgTSO              *tso    STG_UNUSED, 
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                                        StgThreadReturnCode  status STG_UNUSED,
                                        StgWord32           info    STG_UNUSED)
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{
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    traceSchedEvent2(cap, EVENT_STOP_THREAD, tso, status, info);
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    dtraceStopThread((EventCapNo)cap->no, (EventThreadID)tso->id,
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                     (EventThreadStatus)status, (EventThreadID)info);
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}

// needs to be EXTERN_INLINE as it is used in another EXTERN_INLINE function
EXTERN_INLINE void traceEventThreadRunnable(Capability *cap STG_UNUSED, 
                                            StgTSO     *tso STG_UNUSED);

EXTERN_INLINE void traceEventThreadRunnable(Capability *cap STG_UNUSED, 
                                            StgTSO     *tso STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_THREAD_RUNNABLE, tso, 0);
    dtraceThreadRunnable((EventCapNo)cap->no, (EventThreadID)tso->id);
}

INLINE_HEADER void traceEventMigrateThread(Capability *cap     STG_UNUSED, 
                                           StgTSO     *tso     STG_UNUSED,
                                           nat         new_cap STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_MIGRATE_THREAD, tso, new_cap);
    dtraceMigrateThread((EventCapNo)cap->no, (EventThreadID)tso->id,
                        (EventCapNo)new_cap);
}

INLINE_HEADER void traceEventShutdown(Capability *cap STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_SHUTDOWN, 0, 0);
    dtraceShutdown((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventThreadWakeup(Capability *cap       STG_UNUSED, 
                                          StgTSO     *tso       STG_UNUSED,
                                          nat         other_cap STG_UNUSED)
{
    traceSchedEvent(cap, EVENT_THREAD_WAKEUP, tso, other_cap);
    dtraceThreadWakeup((EventCapNo)cap->no, (EventThreadID)tso->id,
                       (EventCapNo)other_cap);
}

INLINE_HEADER void traceEventGcStart(Capability *cap STG_UNUSED)
{
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    traceGcEvent(cap, EVENT_GC_START);
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    dtraceGcStart((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventGcEnd(Capability *cap STG_UNUSED)
{
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    traceGcEvent(cap, EVENT_GC_END);
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    dtraceGcEnd((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventRequestSeqGc(Capability *cap STG_UNUSED)
{
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    traceGcEvent(cap, EVENT_REQUEST_SEQ_GC);
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    dtraceRequestSeqGc((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventRequestParGc(Capability *cap STG_UNUSED)
{
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    traceGcEvent(cap, EVENT_REQUEST_PAR_GC);
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    dtraceRequestParGc((EventCapNo)cap->no);
}

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INLINE_HEADER void traceEventGcIdle(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_IDLE);
    dtraceGcIdle((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventGcWork(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_WORK);
    dtraceGcWork((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventGcDone(Capability *cap STG_UNUSED)
{
    traceGcEvent(cap, EVENT_GC_DONE);
    dtraceGcDone((EventCapNo)cap->no);
}

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INLINE_HEADER void traceEventStartup(void)
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{
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    int n_caps;
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#ifdef THREADED_RTS
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    // XXX n_capabilities hasn't been initialised yet
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    n_caps = RtsFlags.ParFlags.nNodes;
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#else
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    n_caps = 1;
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#endif
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    traceEventStartup_(n_caps);
    dtraceStartup(n_caps);
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}

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INLINE_HEADER void traceCapsetCreate(CapsetID   capset      STG_UNUSED,
                                     CapsetType capset_type STG_UNUSED)
{
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    traceCapsetEvent_(EVENT_CAPSET_CREATE, capset, capset_type);
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    dtraceCapsetCreate(capset, capset_type);
}

INLINE_HEADER void traceCapsetDelete(CapsetID capset STG_UNUSED)
{
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    traceCapsetEvent_(EVENT_CAPSET_DELETE, capset, 0);
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    dtraceCapsetDelete(capset);
}

INLINE_HEADER void traceCapsetAssignCap(CapsetID capset STG_UNUSED,
                                        nat      capno  STG_UNUSED)
{
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    traceCapsetEvent_(EVENT_CAPSET_ASSIGN_CAP, capset, capno);
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    dtraceCapsetAssignCap(capset, capno);
}

INLINE_HEADER void traceCapsetRemoveCap(CapsetID capset STG_UNUSED,
                                        nat      capno  STG_UNUSED)
{
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    traceCapsetEvent_(EVENT_CAPSET_REMOVE_CAP, capset, capno);
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    dtraceCapsetRemoveCap(capset, capno);
}

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INLINE_HEADER void traceWallClockTime(void)
{
    traceWallClockTime_();
    /* Note: no DTrace equivalent because it is available to DTrace directly */
}

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INLINE_HEADER void traceOSProcessInfo(void)
{
    traceOSProcessInfo_();
    /* Note: no DTrace equivalent because all this OS process info
     * is available to DTrace directly */
}

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INLINE_HEADER void traceEventCreateSparkThread(Capability  *cap      STG_UNUSED, 
                                               StgThreadID spark_tid STG_UNUSED)
{
    traceSparkEvent2(cap, EVENT_CREATE_SPARK_THREAD, spark_tid);
    dtraceCreateSparkThread((EventCapNo)cap->no, (EventThreadID)spark_tid);
}

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INLINE_HEADER void traceSparkCounters(Capability *cap STG_UNUSED)
{
#ifdef THREADED_RTS
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    if (RTS_UNLIKELY(TRACE_spark_sampled)) {
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        traceSparkCounters_(cap, cap->spark_stats, sparkPoolSize(cap->sparks));
    }
    dtraceSparkCounters((EventCapNo)cap->no,
                        cap->spark_stats.created,
                        cap->spark_stats.dud,
                        cap->spark_stats.overflowed,
                        cap->spark_stats.converted,
                        cap->spark_stats.gcd,
                        cap->spark_stats.fizzled,
                        sparkPoolSize(cap->sparks));
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#endif
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}

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INLINE_HEADER void traceEventSparkCreate(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_CREATE);
    dtraceSparkCreate((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkDud(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_DUD);
    dtraceSparkDud((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkOverflow(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_OVERFLOW);
    dtraceSparkOverflow((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkRun(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_RUN);
    dtraceSparkRun((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkSteal(Capability *cap STG_UNUSED,
                                        nat         victim_cap STG_UNUSED)
{
    traceSparkEvent2(cap, EVENT_SPARK_STEAL, victim_cap);
    dtraceSparkSteal((EventCapNo)cap->no, (EventCapNo)victim_cap);
}

INLINE_HEADER void traceEventSparkFizzle(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_FIZZLE);
    dtraceSparkFizzle((EventCapNo)cap->no);
}

INLINE_HEADER void traceEventSparkGC(Capability *cap STG_UNUSED)
{
    traceSparkEvent(cap, EVENT_SPARK_GC);
    dtraceSparkGc((EventCapNo)cap->no);
}
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#include "EndPrivate.h"
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#endif /* TRACE_H */