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kmp_csupport.c
2871 lines (2394 loc) · 97.6 KB
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kmp_csupport.c
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/*
* kmp_csupport.c -- kfront linkage support for OpenMP.
*/
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//
#include "omp.h" /* extern "C" declarations of user-visible routines */
#include "kmp.h"
#include "kmp_i18n.h"
#include "kmp_itt.h"
#include "kmp_error.h"
#include "kmp_stats.h"
#if OMPT_SUPPORT
#include "ompt-internal.h"
#include "ompt-specific.h"
#endif
#define MAX_MESSAGE 512
/* ------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------ */
/* flags will be used in future, e.g., to implement */
/* openmp_strict library restrictions */
/*!
* @ingroup STARTUP_SHUTDOWN
* @param loc in source location information
* @param flags in for future use (currently ignored)
*
* Initialize the runtime library. This call is optional; if it is not made then
* it will be implicitly called by attempts to use other library functions.
*
*/
void
__kmpc_begin(ident_t *loc, kmp_int32 flags)
{
// By default __kmp_ignore_mppbeg() returns TRUE.
if (__kmp_ignore_mppbeg() == FALSE) {
__kmp_internal_begin();
KC_TRACE( 10, ("__kmpc_begin: called\n" ) );
}
}
/*!
* @ingroup STARTUP_SHUTDOWN
* @param loc source location information
*
* Shutdown the runtime library. This is also optional, and even if called will not
* do anything unless the `KMP_IGNORE_MPPEND` environment variable is set to zero.
*/
void
__kmpc_end(ident_t *loc)
{
// By default, __kmp_ignore_mppend() returns TRUE which makes __kmpc_end() call no-op.
// However, this can be overridden with KMP_IGNORE_MPPEND environment variable.
// If KMP_IGNORE_MPPEND is 0, __kmp_ignore_mppend() returns FALSE and __kmpc_end()
// will unregister this root (it can cause library shut down).
if (__kmp_ignore_mppend() == FALSE) {
KC_TRACE( 10, ("__kmpc_end: called\n" ) );
KA_TRACE( 30, ("__kmpc_end\n" ));
__kmp_internal_end_thread( -1 );
}
}
/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The global thread index of the active thread.
This function can be called in any context.
If the runtime has ony been entered at the outermost level from a
single (necessarily non-OpenMP<sup>*</sup>) thread, then the thread number is that
which would be returned by omp_get_thread_num() in the outermost
active parallel construct. (Or zero if there is no active parallel
construct, since the master thread is necessarily thread zero).
If multiple non-OpenMP threads all enter an OpenMP construct then this
will be a unique thread identifier among all the threads created by
the OpenMP runtime (but the value cannote be defined in terms of
OpenMP thread ids returned by omp_get_thread_num()).
*/
kmp_int32
__kmpc_global_thread_num(ident_t *loc)
{
kmp_int32 gtid = __kmp_entry_gtid();
KC_TRACE( 10, ("__kmpc_global_thread_num: T#%d\n", gtid ) );
return gtid;
}
/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The number of threads under control of the OpenMP<sup>*</sup> runtime
This function can be called in any context.
It returns the total number of threads under the control of the OpenMP runtime. That is
not a number that can be determined by any OpenMP standard calls, since the library may be
called from more than one non-OpenMP thread, and this reflects the total over all such calls.
Similarly the runtime maintains underlying threads even when they are not active (since the cost
of creating and destroying OS threads is high), this call counts all such threads even if they are not
waiting for work.
*/
kmp_int32
__kmpc_global_num_threads(ident_t *loc)
{
KC_TRACE( 10, ("__kmpc_global_num_threads: num_threads = %d\n", __kmp_nth ) );
return TCR_4(__kmp_nth);
}
/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The thread number of the calling thread in the innermost active parallel construct.
*/
kmp_int32
__kmpc_bound_thread_num(ident_t *loc)
{
KC_TRACE( 10, ("__kmpc_bound_thread_num: called\n" ) );
return __kmp_tid_from_gtid( __kmp_entry_gtid() );
}
/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return The number of threads in the innermost active parallel construct.
*/
kmp_int32
__kmpc_bound_num_threads(ident_t *loc)
{
KC_TRACE( 10, ("__kmpc_bound_num_threads: called\n" ) );
return __kmp_entry_thread() -> th.th_team -> t.t_nproc;
}
/*!
* @ingroup DEPRECATED
* @param loc location description
*
* This function need not be called. It always returns TRUE.
*/
kmp_int32
__kmpc_ok_to_fork(ident_t *loc)
{
#ifndef KMP_DEBUG
return TRUE;
#else
const char *semi2;
const char *semi3;
int line_no;
if (__kmp_par_range == 0) {
return TRUE;
}
semi2 = loc->psource;
if (semi2 == NULL) {
return TRUE;
}
semi2 = strchr(semi2, ';');
if (semi2 == NULL) {
return TRUE;
}
semi2 = strchr(semi2 + 1, ';');
if (semi2 == NULL) {
return TRUE;
}
if (__kmp_par_range_filename[0]) {
const char *name = semi2 - 1;
while ((name > loc->psource) && (*name != '/') && (*name != ';')) {
name--;
}
if ((*name == '/') || (*name == ';')) {
name++;
}
if (strncmp(__kmp_par_range_filename, name, semi2 - name)) {
return __kmp_par_range < 0;
}
}
semi3 = strchr(semi2 + 1, ';');
if (__kmp_par_range_routine[0]) {
if ((semi3 != NULL) && (semi3 > semi2)
&& (strncmp(__kmp_par_range_routine, semi2 + 1, semi3 - semi2 - 1))) {
return __kmp_par_range < 0;
}
}
if (KMP_SSCANF(semi3 + 1, "%d", &line_no) == 1) {
if ((line_no >= __kmp_par_range_lb) && (line_no <= __kmp_par_range_ub)) {
return __kmp_par_range > 0;
}
return __kmp_par_range < 0;
}
return TRUE;
#endif /* KMP_DEBUG */
}
/*!
@ingroup THREAD_STATES
@param loc Source location information.
@return 1 if this thread is executing inside an active parallel region, zero if not.
*/
kmp_int32
__kmpc_in_parallel( ident_t *loc )
{
return __kmp_entry_thread() -> th.th_root -> r.r_active;
}
/*!
@ingroup PARALLEL
@param loc source location information
@param global_tid global thread number
@param num_threads number of threads requested for this parallel construct
Set the number of threads to be used by the next fork spawned by this thread.
This call is only required if the parallel construct has a `num_threads` clause.
*/
void
__kmpc_push_num_threads(ident_t *loc, kmp_int32 global_tid, kmp_int32 num_threads )
{
KA_TRACE( 20, ("__kmpc_push_num_threads: enter T#%d num_threads=%d\n",
global_tid, num_threads ) );
__kmp_push_num_threads( loc, global_tid, num_threads );
}
void
__kmpc_pop_num_threads(ident_t *loc, kmp_int32 global_tid )
{
KA_TRACE( 20, ("__kmpc_pop_num_threads: enter\n" ) );
/* the num_threads are automatically popped */
}
#if OMP_40_ENABLED
void
__kmpc_push_proc_bind(ident_t *loc, kmp_int32 global_tid, kmp_int32 proc_bind )
{
KA_TRACE( 20, ("__kmpc_push_proc_bind: enter T#%d proc_bind=%d\n",
global_tid, proc_bind ) );
__kmp_push_proc_bind( loc, global_tid, (kmp_proc_bind_t)proc_bind );
}
#endif /* OMP_40_ENABLED */
/*!
@ingroup PARALLEL
@param loc source location information
@param argc total number of arguments in the ellipsis
@param microtask pointer to callback routine consisting of outlined parallel construct
@param ... pointers to shared variables that aren't global
Do the actual fork and call the microtask in the relevant number of threads.
*/
void
__kmpc_fork_call(ident_t *loc, kmp_int32 argc, kmpc_micro microtask, ...)
{
int gtid = __kmp_entry_gtid();
#if (KMP_STATS_ENABLED)
int inParallel = __kmpc_in_parallel(loc);
if (inParallel)
{
KMP_COUNT_BLOCK(OMP_NESTED_PARALLEL);
}
else
{
KMP_STOP_EXPLICIT_TIMER(OMP_serial);
KMP_COUNT_BLOCK(OMP_PARALLEL);
}
#endif
// maybe to save thr_state is enough here
{
va_list ap;
va_start( ap, microtask );
#if OMPT_SUPPORT
int tid = __kmp_tid_from_gtid( gtid );
kmp_info_t *master_th = __kmp_threads[ gtid ];
kmp_team_t *parent_team = master_th->th.th_team;
if (ompt_status & ompt_status_track) {
parent_team->t.t_implicit_task_taskdata[tid].
ompt_task_info.frame.reenter_runtime_frame = __builtin_frame_address(0);
}
#endif
#if INCLUDE_SSC_MARKS
SSC_MARK_FORKING();
#endif
__kmp_fork_call( loc, gtid, fork_context_intel,
argc,
#if OMPT_SUPPORT
VOLATILE_CAST(void *) microtask, // "unwrapped" task
#endif
VOLATILE_CAST(microtask_t) microtask, // "wrapped" task
VOLATILE_CAST(launch_t) __kmp_invoke_task_func,
/* TODO: revert workaround for Intel(R) 64 tracker #96 */
#if (KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64) && KMP_OS_LINUX
&ap
#else
ap
#endif
);
#if INCLUDE_SSC_MARKS
SSC_MARK_JOINING();
#endif
__kmp_join_call( loc, gtid
#if OMPT_SUPPORT
, fork_context_intel
#endif
);
va_end( ap );
#if OMPT_SUPPORT
if (ompt_status & ompt_status_track) {
parent_team->t.t_implicit_task_taskdata[tid].
ompt_task_info.frame.reenter_runtime_frame = 0;
}
#endif
}
#if (KMP_STATS_ENABLED)
if (!inParallel)
KMP_START_EXPLICIT_TIMER(OMP_serial);
#endif
}
#if OMP_40_ENABLED
/*!
@ingroup PARALLEL
@param loc source location information
@param global_tid global thread number
@param num_teams number of teams requested for the teams construct
@param num_threads number of threads per team requested for the teams construct
Set the number of teams to be used by the teams construct.
This call is only required if the teams construct has a `num_teams` clause
or a `thread_limit` clause (or both).
*/
void
__kmpc_push_num_teams(ident_t *loc, kmp_int32 global_tid, kmp_int32 num_teams, kmp_int32 num_threads )
{
KA_TRACE( 20, ("__kmpc_push_num_teams: enter T#%d num_teams=%d num_threads=%d\n",
global_tid, num_teams, num_threads ) );
__kmp_push_num_teams( loc, global_tid, num_teams, num_threads );
}
/*!
@ingroup PARALLEL
@param loc source location information
@param argc total number of arguments in the ellipsis
@param microtask pointer to callback routine consisting of outlined teams construct
@param ... pointers to shared variables that aren't global
Do the actual fork and call the microtask in the relevant number of threads.
*/
void
__kmpc_fork_teams(ident_t *loc, kmp_int32 argc, kmpc_micro microtask, ...)
{
int gtid = __kmp_entry_gtid();
kmp_info_t *this_thr = __kmp_threads[ gtid ];
va_list ap;
va_start( ap, microtask );
KMP_COUNT_BLOCK(OMP_TEAMS);
// remember teams entry point and nesting level
this_thr->th.th_teams_microtask = microtask;
this_thr->th.th_teams_level = this_thr->th.th_team->t.t_level; // AC: can be >0 on host
#if OMPT_SUPPORT
kmp_team_t *parent_team = this_thr->th.th_team;
int tid = __kmp_tid_from_gtid( gtid );
if (ompt_status & ompt_status_track) {
parent_team->t.t_implicit_task_taskdata[tid].
ompt_task_info.frame.reenter_runtime_frame = __builtin_frame_address(0);
}
#endif
// check if __kmpc_push_num_teams called, set default number of teams otherwise
if ( this_thr->th.th_teams_size.nteams == 0 ) {
__kmp_push_num_teams( loc, gtid, 0, 0 );
}
KMP_DEBUG_ASSERT(this_thr->th.th_set_nproc >= 1);
KMP_DEBUG_ASSERT(this_thr->th.th_teams_size.nteams >= 1);
KMP_DEBUG_ASSERT(this_thr->th.th_teams_size.nth >= 1);
__kmp_fork_call( loc, gtid, fork_context_intel,
argc,
#if OMPT_SUPPORT
VOLATILE_CAST(void *) microtask, // "unwrapped" task
#endif
VOLATILE_CAST(microtask_t) __kmp_teams_master, // "wrapped" task
VOLATILE_CAST(launch_t) __kmp_invoke_teams_master,
#if (KMP_ARCH_X86_64 || KMP_ARCH_ARM || KMP_ARCH_AARCH64) && KMP_OS_LINUX
&ap
#else
ap
#endif
);
__kmp_join_call( loc, gtid
#if OMPT_SUPPORT
, fork_context_intel
#endif
);
#if OMPT_SUPPORT
if (ompt_status & ompt_status_track) {
parent_team->t.t_implicit_task_taskdata[tid].
ompt_task_info.frame.reenter_runtime_frame = NULL;
}
#endif
this_thr->th.th_teams_microtask = NULL;
this_thr->th.th_teams_level = 0;
*(kmp_int64*)(&this_thr->th.th_teams_size) = 0L;
va_end( ap );
}
#endif /* OMP_40_ENABLED */
//
// I don't think this function should ever have been exported.
// The __kmpc_ prefix was misapplied. I'm fairly certain that no generated
// openmp code ever called it, but it's been exported from the RTL for so
// long that I'm afraid to remove the definition.
//
int
__kmpc_invoke_task_func( int gtid )
{
return __kmp_invoke_task_func( gtid );
}
/*!
@ingroup PARALLEL
@param loc source location information
@param global_tid global thread number
Enter a serialized parallel construct. This interface is used to handle a
conditional parallel region, like this,
@code
#pragma omp parallel if (condition)
@endcode
when the condition is false.
*/
void
__kmpc_serialized_parallel(ident_t *loc, kmp_int32 global_tid)
{
__kmp_serialized_parallel(loc, global_tid); /* The implementation is now in kmp_runtime.c so that it can share static functions with
* kmp_fork_call since the tasks to be done are similar in each case.
*/
}
/*!
@ingroup PARALLEL
@param loc source location information
@param global_tid global thread number
Leave a serialized parallel construct.
*/
void
__kmpc_end_serialized_parallel(ident_t *loc, kmp_int32 global_tid)
{
kmp_internal_control_t *top;
kmp_info_t *this_thr;
kmp_team_t *serial_team;
KC_TRACE( 10, ("__kmpc_end_serialized_parallel: called by T#%d\n", global_tid ) );
/* skip all this code for autopar serialized loops since it results in
unacceptable overhead */
if( loc != NULL && (loc->flags & KMP_IDENT_AUTOPAR ) )
return;
// Not autopar code
if( ! TCR_4( __kmp_init_parallel ) )
__kmp_parallel_initialize();
this_thr = __kmp_threads[ global_tid ];
serial_team = this_thr->th.th_serial_team;
#if OMP_41_ENABLED
kmp_task_team_t * task_team = this_thr->th.th_task_team;
// we need to wait for the proxy tasks before finishing the thread
if ( task_team != NULL && task_team->tt.tt_found_proxy_tasks )
__kmp_task_team_wait(this_thr, serial_team, NULL ); // is an ITT object needed here?
#endif
KMP_MB();
KMP_DEBUG_ASSERT( serial_team );
KMP_ASSERT( serial_team -> t.t_serialized );
KMP_DEBUG_ASSERT( this_thr -> th.th_team == serial_team );
KMP_DEBUG_ASSERT( serial_team != this_thr->th.th_root->r.r_root_team );
KMP_DEBUG_ASSERT( serial_team -> t.t_threads );
KMP_DEBUG_ASSERT( serial_team -> t.t_threads[0] == this_thr );
/* If necessary, pop the internal control stack values and replace the team values */
top = serial_team -> t.t_control_stack_top;
if ( top && top -> serial_nesting_level == serial_team -> t.t_serialized ) {
copy_icvs( &serial_team -> t.t_threads[0] -> th.th_current_task -> td_icvs, top );
serial_team -> t.t_control_stack_top = top -> next;
__kmp_free(top);
}
//if( serial_team -> t.t_serialized > 1 )
serial_team -> t.t_level--;
/* pop dispatch buffers stack */
KMP_DEBUG_ASSERT(serial_team->t.t_dispatch->th_disp_buffer);
{
dispatch_private_info_t * disp_buffer = serial_team->t.t_dispatch->th_disp_buffer;
serial_team->t.t_dispatch->th_disp_buffer =
serial_team->t.t_dispatch->th_disp_buffer->next;
__kmp_free( disp_buffer );
}
-- serial_team -> t.t_serialized;
if ( serial_team -> t.t_serialized == 0 ) {
/* return to the parallel section */
#if KMP_ARCH_X86 || KMP_ARCH_X86_64
if ( __kmp_inherit_fp_control && serial_team->t.t_fp_control_saved ) {
__kmp_clear_x87_fpu_status_word();
__kmp_load_x87_fpu_control_word( &serial_team->t.t_x87_fpu_control_word );
__kmp_load_mxcsr( &serial_team->t.t_mxcsr );
}
#endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */
this_thr -> th.th_team = serial_team -> t.t_parent;
this_thr -> th.th_info.ds.ds_tid = serial_team -> t.t_master_tid;
/* restore values cached in the thread */
this_thr -> th.th_team_nproc = serial_team -> t.t_parent -> t.t_nproc; /* JPH */
this_thr -> th.th_team_master = serial_team -> t.t_parent -> t.t_threads[0]; /* JPH */
this_thr -> th.th_team_serialized = this_thr -> th.th_team -> t.t_serialized;
/* TODO the below shouldn't need to be adjusted for serialized teams */
this_thr -> th.th_dispatch = & this_thr -> th.th_team ->
t.t_dispatch[ serial_team -> t.t_master_tid ];
__kmp_pop_current_task_from_thread( this_thr );
KMP_ASSERT( this_thr -> th.th_current_task -> td_flags.executing == 0 );
this_thr -> th.th_current_task -> td_flags.executing = 1;
if ( __kmp_tasking_mode != tskm_immediate_exec ) {
// Copy the task team from the new child / old parent team to the thread.
this_thr->th.th_task_team = this_thr->th.th_team->t.t_task_team[this_thr->th.th_task_state];
KA_TRACE( 20, ( "__kmpc_end_serialized_parallel: T#%d restoring task_team %p / team %p\n",
global_tid, this_thr -> th.th_task_team, this_thr -> th.th_team ) );
}
} else {
if ( __kmp_tasking_mode != tskm_immediate_exec ) {
KA_TRACE( 20, ( "__kmpc_end_serialized_parallel: T#%d decreasing nesting depth of serial team %p to %d\n",
global_tid, serial_team, serial_team -> t.t_serialized ) );
}
}
#if USE_ITT_BUILD
kmp_uint64 cur_time = 0;
#if USE_ITT_NOTIFY
if ( __itt_get_timestamp_ptr ) {
cur_time = __itt_get_timestamp();
}
#endif /* USE_ITT_NOTIFY */
if ( this_thr->th.th_team->t.t_level == 0
#if OMP_40_ENABLED
&& this_thr->th.th_teams_microtask == NULL
#endif
) {
// Report the barrier
this_thr->th.th_ident = loc;
if ( ( __itt_frame_submit_v3_ptr || KMP_ITT_DEBUG ) &&
( __kmp_forkjoin_frames_mode == 3 || __kmp_forkjoin_frames_mode == 1 ) )
{
__kmp_itt_frame_submit( global_tid, this_thr->th.th_frame_time_serialized,
cur_time, 0, loc, this_thr->th.th_team_nproc, 0 );
if ( __kmp_forkjoin_frames_mode == 3 )
// Since barrier frame for serialized region is equal to the region we use the same begin timestamp as for the barrier.
__kmp_itt_frame_submit( global_tid, serial_team->t.t_region_time,
cur_time, 0, loc, this_thr->th.th_team_nproc, 2 );
} else if ( ( __itt_frame_end_v3_ptr || KMP_ITT_DEBUG ) &&
! __kmp_forkjoin_frames_mode && __kmp_forkjoin_frames )
// Mark the end of the "parallel" region for VTune. Only use one of frame notification scheme at the moment.
__kmp_itt_region_joined( global_tid, 1 );
}
#endif /* USE_ITT_BUILD */
if ( __kmp_env_consistency_check )
__kmp_pop_parallel( global_tid, NULL );
}
/*!
@ingroup SYNCHRONIZATION
@param loc source location information.
Execute <tt>flush</tt>. This is implemented as a full memory fence. (Though
depending on the memory ordering convention obeyed by the compiler
even that may not be necessary).
*/
void
__kmpc_flush(ident_t *loc)
{
KC_TRACE( 10, ("__kmpc_flush: called\n" ) );
/* need explicit __mf() here since use volatile instead in library */
KMP_MB(); /* Flush all pending memory write invalidates. */
#if ( KMP_ARCH_X86 || KMP_ARCH_X86_64 )
#if KMP_MIC
// fence-style instructions do not exist, but lock; xaddl $0,(%rsp) can be used.
// We shouldn't need it, though, since the ABI rules require that
// * If the compiler generates NGO stores it also generates the fence
// * If users hand-code NGO stores they should insert the fence
// therefore no incomplete unordered stores should be visible.
#else
// C74404
// This is to address non-temporal store instructions (sfence needed).
// The clflush instruction is addressed either (mfence needed).
// Probably the non-temporal load monvtdqa instruction should also be addressed.
// mfence is a SSE2 instruction. Do not execute it if CPU is not SSE2.
if ( ! __kmp_cpuinfo.initialized ) {
__kmp_query_cpuid( & __kmp_cpuinfo );
}; // if
if ( ! __kmp_cpuinfo.sse2 ) {
// CPU cannot execute SSE2 instructions.
} else {
#if KMP_COMPILER_ICC || KMP_COMPILER_MSVC
_mm_mfence();
#else
__sync_synchronize();
#endif // KMP_COMPILER_ICC
}; // if
#endif // KMP_MIC
#elif (KMP_ARCH_ARM || KMP_ARCH_AARCH64)
// Nothing to see here move along
#elif KMP_ARCH_PPC64
// Nothing needed here (we have a real MB above).
#if KMP_OS_CNK
// The flushing thread needs to yield here; this prevents a
// busy-waiting thread from saturating the pipeline. flush is
// often used in loops like this:
// while (!flag) {
// #pragma omp flush(flag)
// }
// and adding the yield here is good for at least a 10x speedup
// when running >2 threads per core (on the NAS LU benchmark).
__kmp_yield(TRUE);
#endif
#else
#error Unknown or unsupported architecture
#endif
}
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
/*!
@ingroup SYNCHRONIZATION
@param loc source location information
@param global_tid thread id.
Execute a barrier.
*/
void
__kmpc_barrier(ident_t *loc, kmp_int32 global_tid)
{
KMP_COUNT_BLOCK(OMP_BARRIER);
KMP_TIME_BLOCK(OMP_barrier);
KC_TRACE( 10, ("__kmpc_barrier: called T#%d\n", global_tid ) );
if (! TCR_4(__kmp_init_parallel))
__kmp_parallel_initialize();
if ( __kmp_env_consistency_check ) {
if ( loc == 0 ) {
KMP_WARNING( ConstructIdentInvalid ); // ??? What does it mean for the user?
}; // if
__kmp_check_barrier( global_tid, ct_barrier, loc );
}
__kmp_threads[ global_tid ]->th.th_ident = loc;
// TODO: explicit barrier_wait_id:
// this function is called when 'barrier' directive is present or
// implicit barrier at the end of a worksharing construct.
// 1) better to add a per-thread barrier counter to a thread data structure
// 2) set to 0 when a new team is created
// 4) no sync is required
__kmp_barrier( bs_plain_barrier, global_tid, FALSE, 0, NULL, NULL );
}
/* The BARRIER for a MASTER section is always explicit */
/*!
@ingroup WORK_SHARING
@param loc source location information.
@param global_tid global thread number .
@return 1 if this thread should execute the <tt>master</tt> block, 0 otherwise.
*/
kmp_int32
__kmpc_master(ident_t *loc, kmp_int32 global_tid)
{
KMP_COUNT_BLOCK(OMP_MASTER);
int status = 0;
KC_TRACE( 10, ("__kmpc_master: called T#%d\n", global_tid ) );
if( ! TCR_4( __kmp_init_parallel ) )
__kmp_parallel_initialize();
if( KMP_MASTER_GTID( global_tid )) {
KMP_START_EXPLICIT_TIMER(OMP_master);
status = 1;
}
#if OMPT_SUPPORT && OMPT_TRACE
if (status) {
if ((ompt_status == ompt_status_track_callback) &&
ompt_callbacks.ompt_callback(ompt_event_master_begin)) {
kmp_info_t *this_thr = __kmp_threads[ global_tid ];
kmp_team_t *team = this_thr -> th.th_team;
int tid = __kmp_tid_from_gtid( global_tid );
ompt_callbacks.ompt_callback(ompt_event_master_begin)(
team->t.ompt_team_info.parallel_id,
team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id);
}
}
#endif
if ( __kmp_env_consistency_check ) {
#if KMP_USE_DYNAMIC_LOCK
if (status)
__kmp_push_sync( global_tid, ct_master, loc, NULL, 0 );
else
__kmp_check_sync( global_tid, ct_master, loc, NULL, 0 );
#else
if (status)
__kmp_push_sync( global_tid, ct_master, loc, NULL );
else
__kmp_check_sync( global_tid, ct_master, loc, NULL );
#endif
}
return status;
}
/*!
@ingroup WORK_SHARING
@param loc source location information.
@param global_tid global thread number .
Mark the end of a <tt>master</tt> region. This should only be called by the thread
that executes the <tt>master</tt> region.
*/
void
__kmpc_end_master(ident_t *loc, kmp_int32 global_tid)
{
KC_TRACE( 10, ("__kmpc_end_master: called T#%d\n", global_tid ) );
KMP_DEBUG_ASSERT( KMP_MASTER_GTID( global_tid ));
KMP_STOP_EXPLICIT_TIMER(OMP_master);
#if OMPT_SUPPORT && OMPT_TRACE
kmp_info_t *this_thr = __kmp_threads[ global_tid ];
kmp_team_t *team = this_thr -> th.th_team;
if ((ompt_status == ompt_status_track_callback) &&
ompt_callbacks.ompt_callback(ompt_event_master_end)) {
int tid = __kmp_tid_from_gtid( global_tid );
ompt_callbacks.ompt_callback(ompt_event_master_end)(
team->t.ompt_team_info.parallel_id,
team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_id);
}
#endif
if ( __kmp_env_consistency_check ) {
if( global_tid < 0 )
KMP_WARNING( ThreadIdentInvalid );
if( KMP_MASTER_GTID( global_tid ))
__kmp_pop_sync( global_tid, ct_master, loc );
}
}
/*!
@ingroup WORK_SHARING
@param loc source location information.
@param gtid global thread number.
Start execution of an <tt>ordered</tt> construct.
*/
void
__kmpc_ordered( ident_t * loc, kmp_int32 gtid )
{
int cid = 0;
kmp_info_t *th;
KMP_DEBUG_ASSERT( __kmp_init_serial );
KC_TRACE( 10, ("__kmpc_ordered: called T#%d\n", gtid ));
if (! TCR_4(__kmp_init_parallel))
__kmp_parallel_initialize();
#if USE_ITT_BUILD
__kmp_itt_ordered_prep( gtid );
// TODO: ordered_wait_id
#endif /* USE_ITT_BUILD */
th = __kmp_threads[ gtid ];
#if OMPT_SUPPORT && OMPT_TRACE
if (ompt_status & ompt_status_track) {
/* OMPT state update */
th->th.ompt_thread_info.wait_id = (uint64_t) loc;
th->th.ompt_thread_info.state = ompt_state_wait_ordered;
/* OMPT event callback */
if ((ompt_status == ompt_status_track_callback) &&
ompt_callbacks.ompt_callback(ompt_event_wait_ordered)) {
ompt_callbacks.ompt_callback(ompt_event_wait_ordered)(
th->th.ompt_thread_info.wait_id);
}
}
#endif
if ( th -> th.th_dispatch -> th_deo_fcn != 0 )
(*th->th.th_dispatch->th_deo_fcn)( & gtid, & cid, loc );
else
__kmp_parallel_deo( & gtid, & cid, loc );
#if OMPT_SUPPORT && OMPT_TRACE
if (ompt_status & ompt_status_track) {
/* OMPT state update */
th->th.ompt_thread_info.state = ompt_state_work_parallel;
th->th.ompt_thread_info.wait_id = 0;
/* OMPT event callback */
if ((ompt_status == ompt_status_track_callback) &&
ompt_callbacks.ompt_callback(ompt_event_acquired_ordered)) {
ompt_callbacks.ompt_callback(ompt_event_acquired_ordered)(
th->th.ompt_thread_info.wait_id);
}
}
#endif
#if USE_ITT_BUILD
__kmp_itt_ordered_start( gtid );
#endif /* USE_ITT_BUILD */
}
/*!
@ingroup WORK_SHARING
@param loc source location information.
@param gtid global thread number.
End execution of an <tt>ordered</tt> construct.
*/
void
__kmpc_end_ordered( ident_t * loc, kmp_int32 gtid )
{
int cid = 0;
kmp_info_t *th;
KC_TRACE( 10, ("__kmpc_end_ordered: called T#%d\n", gtid ) );
#if USE_ITT_BUILD
__kmp_itt_ordered_end( gtid );
// TODO: ordered_wait_id
#endif /* USE_ITT_BUILD */
th = __kmp_threads[ gtid ];
if ( th -> th.th_dispatch -> th_dxo_fcn != 0 )
(*th->th.th_dispatch->th_dxo_fcn)( & gtid, & cid, loc );
else
__kmp_parallel_dxo( & gtid, & cid, loc );
#if OMPT_SUPPORT && OMPT_BLAME
if ((ompt_status == ompt_status_track_callback) &&
ompt_callbacks.ompt_callback(ompt_event_release_ordered)) {
ompt_callbacks.ompt_callback(ompt_event_release_ordered)(
th->th.ompt_thread_info.wait_id);
}
#endif
}
#if KMP_USE_DYNAMIC_LOCK
static __forceinline kmp_indirect_lock_t *
__kmp_get_indirect_csptr(kmp_critical_name * crit, ident_t const * loc, kmp_int32 gtid, kmp_dyna_lockseq_t seq)
{
// Code from __kmp_get_critical_section_ptr
// This function returns an indirect lock object instead of a user lock.
kmp_indirect_lock_t **lck, *ret;
lck = (kmp_indirect_lock_t **)crit;
ret = (kmp_indirect_lock_t *)TCR_PTR(*lck);
if (ret == NULL) {
void *idx;
kmp_indirect_locktag_t tag = DYNA_GET_I_TAG(seq);
kmp_indirect_lock_t *ilk = __kmp_allocate_indirect_lock(&idx, gtid, tag);
ret = ilk;
DYNA_I_LOCK_FUNC(ilk, init)(ilk->lock);
DYNA_SET_I_LOCK_LOCATION(ilk, loc);
DYNA_SET_I_LOCK_FLAGS(ilk, kmp_lf_critical_section);
KA_TRACE(20, ("__kmp_get_indirect_csptr: initialized indirect lock #%d\n", tag));
#if USE_ITT_BUILD
__kmp_itt_critical_creating(ilk->lock, loc);
#endif
int status = KMP_COMPARE_AND_STORE_PTR(lck, 0, ilk);
if (status == 0) {
#if USE_ITT_BUILD
__kmp_itt_critical_destroyed(ilk->lock);
#endif
// Postponing destroy, to avoid costly dispatch here.
//DYNA_D_LOCK_FUNC(&idx, destroy)((kmp_dyna_lock_t *)&idx);
ret = (kmp_indirect_lock_t *)TCR_PTR(*lck);
KMP_DEBUG_ASSERT(ret != NULL);
}
}
return ret;
}
// Fast-path acquire tas lock
#define DYNA_ACQUIRE_TAS_LOCK(lock, gtid) { \
kmp_tas_lock_t *l = (kmp_tas_lock_t *)lock; \
if (l->lk.poll != DYNA_LOCK_FREE(tas) || \
! KMP_COMPARE_AND_STORE_ACQ32(&(l->lk.poll), DYNA_LOCK_FREE(tas), DYNA_LOCK_BUSY(gtid+1, tas))) { \
kmp_uint32 spins; \
KMP_FSYNC_PREPARE(l); \
KMP_INIT_YIELD(spins); \
if (TCR_4(__kmp_nth) > (__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc)) { \
KMP_YIELD(TRUE); \
} else { \
KMP_YIELD_SPIN(spins); \
} \
while (l->lk.poll != DYNA_LOCK_FREE(tas) || \
! KMP_COMPARE_AND_STORE_ACQ32(&(l->lk.poll), DYNA_LOCK_FREE(tas), DYNA_LOCK_BUSY(gtid+1, tas))) { \
if (TCR_4(__kmp_nth) > (__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc)) { \
KMP_YIELD(TRUE); \
} else { \
KMP_YIELD_SPIN(spins); \
} \
} \
} \
KMP_FSYNC_ACQUIRED(l); \
}
// Fast-path test tas lock
#define DYNA_TEST_TAS_LOCK(lock, gtid, rc) { \
kmp_tas_lock_t *l = (kmp_tas_lock_t *)lock; \
rc = l->lk.poll == DYNA_LOCK_FREE(tas) && \
KMP_COMPARE_AND_STORE_ACQ32(&(l->lk.poll), DYNA_LOCK_FREE(tas), DYNA_LOCK_BUSY(gtid+1, tas)); \
}
// Fast-path release tas lock
#define DYNA_RELEASE_TAS_LOCK(lock, gtid) { \
TCW_4(((kmp_tas_lock_t *)lock)->lk.poll, DYNA_LOCK_FREE(tas)); \
KMP_MB(); \
}
#if DYNA_HAS_FUTEX
# include <unistd.h>
# include <sys/syscall.h>
# ifndef FUTEX_WAIT
# define FUTEX_WAIT 0
# endif
# ifndef FUTEX_WAKE