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kmp_csupport.cpp
4434 lines (3885 loc) · 146 KB
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kmp_csupport.cpp
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/*
* kmp_csupport.cpp -- kfront linkage support for OpenMP.
*/
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#define __KMP_IMP
#include "omp.h" /* extern "C" declarations of user-visible routines */
#include "kmp.h"
#include "kmp_error.h"
#include "kmp_i18n.h"
#include "kmp_itt.h"
#include "kmp_lock.h"
#include "kmp_stats.h"
#include "ompt-specific.h"
#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 __kmpc_begin() is no-op.
char *env;
if ((env = getenv("KMP_INITIAL_THREAD_BIND")) != NULL &&
__kmp_str_match_true(env)) {
__kmp_middle_initialize();
__kmp_assign_root_init_mask();
KC_TRACE(10, ("__kmpc_begin: middle initialization called\n"));
} else if (__kmp_ignore_mppbeg() == FALSE) {
// By default __kmp_ignore_mppbeg() returns TRUE.
__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);
}
#if KMP_OS_WINDOWS && OMPT_SUPPORT
// Normal exit process on Windows does not allow worker threads of the final
// parallel region to finish reporting their events, so shutting down the
// library here fixes the issue at least for the cases where __kmpc_end() is
// placed properly.
if (ompt_enabled.enabled)
__kmp_internal_end_library(__kmp_gtid_get_specific());
#endif
}
/*!
@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 primary 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 cannot 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_all_nth));
return TCR_4(__kmp_all_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_assert_valid_gtid(global_tid);
__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 */
}
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_assert_valid_gtid(global_tid);
__kmp_push_proc_bind(loc, global_tid, (kmp_proc_bind_t)proc_bind);
}
/*!
@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)
// If we were in a serial region, then stop the serial timer, record
// the event, and start parallel region timer
stats_state_e previous_state = KMP_GET_THREAD_STATE();
if (previous_state == stats_state_e::SERIAL_REGION) {
KMP_EXCHANGE_PARTITIONED_TIMER(OMP_parallel_overhead);
} else {
KMP_PUSH_PARTITIONED_TIMER(OMP_parallel_overhead);
}
int inParallel = __kmpc_in_parallel(loc);
if (inParallel) {
KMP_COUNT_BLOCK(OMP_NESTED_PARALLEL);
} else {
KMP_COUNT_BLOCK(OMP_PARALLEL);
}
#endif
// maybe to save thr_state is enough here
{
va_list ap;
va_start(ap, microtask);
#if OMPT_SUPPORT
ompt_frame_t *ompt_frame;
if (ompt_enabled.enabled) {
kmp_info_t *master_th = __kmp_threads[gtid];
kmp_team_t *parent_team = master_th->th.th_team;
ompt_lw_taskteam_t *lwt = parent_team->t.ompt_serialized_team_info;
if (lwt)
ompt_frame = &(lwt->ompt_task_info.frame);
else {
int tid = __kmp_tid_from_gtid(gtid);
ompt_frame = &(
parent_team->t.t_implicit_task_taskdata[tid].ompt_task_info.frame);
}
ompt_frame->enter_frame.ptr = OMPT_GET_FRAME_ADDRESS(0);
}
OMPT_STORE_RETURN_ADDRESS(gtid);
#endif
#if INCLUDE_SSC_MARKS
SSC_MARK_FORKING();
#endif
__kmp_fork_call(loc, gtid, fork_context_intel, argc,
VOLATILE_CAST(microtask_t) microtask, // "wrapped" task
VOLATILE_CAST(launch_t) __kmp_invoke_task_func,
kmp_va_addr_of(ap));
#if INCLUDE_SSC_MARKS
SSC_MARK_JOINING();
#endif
__kmp_join_call(loc, gtid
#if OMPT_SUPPORT
,
fork_context_intel
#endif
);
va_end(ap);
}
#if KMP_STATS_ENABLED
if (previous_state == stats_state_e::SERIAL_REGION) {
KMP_EXCHANGE_PARTITIONED_TIMER(OMP_serial);
KMP_SET_THREAD_STATE(previous_state);
} else {
KMP_POP_PARTITIONED_TIMER();
}
#endif // KMP_STATS_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_assert_valid_gtid(global_tid);
__kmp_push_num_teams(loc, global_tid, num_teams, num_threads);
}
/*!
@ingroup PARALLEL
@param loc source location information
@param global_tid global thread number
@param num_teams_lo lower bound on number of teams requested for the teams
construct
@param num_teams_up upper bound on 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. The number of initial
teams cretaed will be greater than or equal to the lower bound and less than or
equal to the upper bound.
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_51(ident_t *loc, kmp_int32 global_tid,
kmp_int32 num_teams_lb, kmp_int32 num_teams_ub,
kmp_int32 num_threads) {
KA_TRACE(20, ("__kmpc_push_num_teams_51: enter T#%d num_teams_lb=%d"
" num_teams_ub=%d num_threads=%d\n",
global_tid, num_teams_lb, num_teams_ub, num_threads));
__kmp_assert_valid_gtid(global_tid);
__kmp_push_num_teams_51(loc, global_tid, num_teams_lb, num_teams_ub,
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);
#if KMP_STATS_ENABLED
KMP_COUNT_BLOCK(OMP_TEAMS);
stats_state_e previous_state = KMP_GET_THREAD_STATE();
if (previous_state == stats_state_e::SERIAL_REGION) {
KMP_EXCHANGE_PARTITIONED_TIMER(OMP_teams_overhead);
} else {
KMP_PUSH_PARTITIONED_TIMER(OMP_teams_overhead);
}
#endif
// 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_enabled.enabled) {
parent_team->t.t_implicit_task_taskdata[tid]
.ompt_task_info.frame.enter_frame.ptr = OMPT_GET_FRAME_ADDRESS(0);
}
OMPT_STORE_RETURN_ADDRESS(gtid);
#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,
VOLATILE_CAST(microtask_t) __kmp_teams_master, // "wrapped" task
VOLATILE_CAST(launch_t) __kmp_invoke_teams_master, kmp_va_addr_of(ap));
__kmp_join_call(loc, gtid
#if OMPT_SUPPORT
,
fork_context_intel
#endif
);
// Pop current CG root off list
KMP_DEBUG_ASSERT(this_thr->th.th_cg_roots);
kmp_cg_root_t *tmp = this_thr->th.th_cg_roots;
this_thr->th.th_cg_roots = tmp->up;
KA_TRACE(100, ("__kmpc_fork_teams: Thread %p popping node %p and moving up"
" to node %p. cg_nthreads was %d\n",
this_thr, tmp, this_thr->th.th_cg_roots, tmp->cg_nthreads));
KMP_DEBUG_ASSERT(tmp->cg_nthreads);
int i = tmp->cg_nthreads--;
if (i == 1) { // check is we are the last thread in CG (not always the case)
__kmp_free(tmp);
}
// Restore current task's thread_limit from CG root
KMP_DEBUG_ASSERT(this_thr->th.th_cg_roots);
this_thr->th.th_current_task->td_icvs.thread_limit =
this_thr->th.th_cg_roots->cg_thread_limit;
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);
#if KMP_STATS_ENABLED
if (previous_state == stats_state_e::SERIAL_REGION) {
KMP_EXCHANGE_PARTITIONED_TIMER(OMP_serial);
KMP_SET_THREAD_STATE(previous_state);
} else {
KMP_POP_PARTITIONED_TIMER();
}
#endif // KMP_STATS_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) {
// The implementation is now in kmp_runtime.cpp so that it can share static
// functions with kmp_fork_call since the tasks to be done are similar in
// each case.
__kmp_assert_valid_gtid(global_tid);
#if OMPT_SUPPORT
OMPT_STORE_RETURN_ADDRESS(global_tid);
#endif
__kmp_serialized_parallel(loc, global_tid);
}
/*!
@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
__kmp_assert_valid_gtid(global_tid);
if (!TCR_4(__kmp_init_parallel))
__kmp_parallel_initialize();
__kmp_resume_if_soft_paused();
this_thr = __kmp_threads[global_tid];
serial_team = this_thr->th.th_serial_team;
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 USE_ITT_BUILD_ARG(NULL));
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 OMPT_SUPPORT
if (ompt_enabled.enabled &&
this_thr->th.ompt_thread_info.state != ompt_state_overhead) {
OMPT_CUR_TASK_INFO(this_thr)->frame.exit_frame = ompt_data_none;
if (ompt_enabled.ompt_callback_implicit_task) {
ompt_callbacks.ompt_callback(ompt_callback_implicit_task)(
ompt_scope_end, NULL, OMPT_CUR_TASK_DATA(this_thr), 1,
OMPT_CUR_TASK_INFO(this_thr)->thread_num, ompt_task_implicit);
}
// reset clear the task id only after unlinking the task
ompt_data_t *parent_task_data;
__ompt_get_task_info_internal(1, NULL, &parent_task_data, NULL, NULL, NULL);
if (ompt_enabled.ompt_callback_parallel_end) {
ompt_callbacks.ompt_callback(ompt_callback_parallel_end)(
&(serial_team->t.ompt_team_info.parallel_data), parent_task_data,
ompt_parallel_invoker_program | ompt_parallel_team,
OMPT_LOAD_RETURN_ADDRESS(global_tid));
}
__ompt_lw_taskteam_unlink(this_thr);
this_thr->th.ompt_thread_info.state = ompt_state_overhead;
}
#endif
/* 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);
}
this_thr->th.th_def_allocator = serial_team->t.t_def_allocator; // restore
--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 */
#if OMPD_SUPPORT
if (ompd_state & OMPD_ENABLE_BP)
ompd_bp_parallel_end();
#endif
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 (__kmp_env_consistency_check)
__kmp_pop_parallel(global_tid, NULL);
#if OMPT_SUPPORT
if (ompt_enabled.enabled)
this_thr->th.ompt_thread_info.state =
((this_thr->th.th_team_serialized) ? ompt_state_work_serial
: ompt_state_work_parallel);
#endif
}
/*!
@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 (!__kmp_cpuinfo.sse2) {
// CPU cannot execute SSE2 instructions.
} else {
#if KMP_COMPILER_ICC
_mm_mfence();
#elif KMP_COMPILER_MSVC
MemoryBarrier();
#else
__sync_synchronize();
#endif // KMP_COMPILER_ICC
}
#endif // KMP_MIC
#elif (KMP_ARCH_ARM || KMP_ARCH_AARCH64 || KMP_ARCH_MIPS || KMP_ARCH_MIPS64 || \
KMP_ARCH_RISCV64)
// Nothing to see here move along
#elif KMP_ARCH_PPC64
// Nothing needed here (we have a real MB above).
#else
#error Unknown or unsupported architecture
#endif
#if OMPT_SUPPORT && OMPT_OPTIONAL
if (ompt_enabled.ompt_callback_flush) {
ompt_callbacks.ompt_callback(ompt_callback_flush)(
__ompt_get_thread_data_internal(), OMPT_GET_RETURN_ADDRESS(0));
}
#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);
KC_TRACE(10, ("__kmpc_barrier: called T#%d\n", global_tid));
__kmp_assert_valid_gtid(global_tid);
if (!TCR_4(__kmp_init_parallel))
__kmp_parallel_initialize();
__kmp_resume_if_soft_paused();
if (__kmp_env_consistency_check) {
if (loc == 0) {
KMP_WARNING(ConstructIdentInvalid); // ??? What does it mean for the user?
}
__kmp_check_barrier(global_tid, ct_barrier, loc);
}
#if OMPT_SUPPORT
ompt_frame_t *ompt_frame;
if (ompt_enabled.enabled) {
__ompt_get_task_info_internal(0, NULL, NULL, &ompt_frame, NULL, NULL);
if (ompt_frame->enter_frame.ptr == NULL)
ompt_frame->enter_frame.ptr = OMPT_GET_FRAME_ADDRESS(0);
}
OMPT_STORE_RETURN_ADDRESS(global_tid);
#endif
__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);
#if OMPT_SUPPORT && OMPT_OPTIONAL
if (ompt_enabled.enabled) {
ompt_frame->enter_frame = ompt_data_none;
}
#endif
}
/* 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) {
int status = 0;
KC_TRACE(10, ("__kmpc_master: called T#%d\n", global_tid));
__kmp_assert_valid_gtid(global_tid);
if (!TCR_4(__kmp_init_parallel))
__kmp_parallel_initialize();
__kmp_resume_if_soft_paused();
if (KMP_MASTER_GTID(global_tid)) {
KMP_COUNT_BLOCK(OMP_MASTER);
KMP_PUSH_PARTITIONED_TIMER(OMP_master);
status = 1;
}
#if OMPT_SUPPORT && OMPT_OPTIONAL
if (status) {
if (ompt_enabled.ompt_callback_masked) {
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_callback_masked)(
ompt_scope_begin, &(team->t.ompt_team_info.parallel_data),
&(team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_data),
OMPT_GET_RETURN_ADDRESS(0));
}
}
#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_assert_valid_gtid(global_tid);
KMP_DEBUG_ASSERT(KMP_MASTER_GTID(global_tid));
KMP_POP_PARTITIONED_TIMER();
#if OMPT_SUPPORT && OMPT_OPTIONAL
kmp_info_t *this_thr = __kmp_threads[global_tid];
kmp_team_t *team = this_thr->th.th_team;
if (ompt_enabled.ompt_callback_masked) {
int tid = __kmp_tid_from_gtid(global_tid);
ompt_callbacks.ompt_callback(ompt_callback_masked)(
ompt_scope_end, &(team->t.ompt_team_info.parallel_data),
&(team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_data),
OMPT_GET_RETURN_ADDRESS(0));
}
#endif
if (__kmp_env_consistency_check) {
if (KMP_MASTER_GTID(global_tid))
__kmp_pop_sync(global_tid, ct_master, loc);
}
}
/*!
@ingroup WORK_SHARING
@param loc source location information.
@param global_tid global thread number.
@param filter result of evaluating filter clause on thread global_tid, or zero
if no filter clause present
@return 1 if this thread should execute the <tt>masked</tt> block, 0 otherwise.
*/
kmp_int32 __kmpc_masked(ident_t *loc, kmp_int32 global_tid, kmp_int32 filter) {
int status = 0;
int tid;
KC_TRACE(10, ("__kmpc_masked: called T#%d\n", global_tid));
__kmp_assert_valid_gtid(global_tid);
if (!TCR_4(__kmp_init_parallel))
__kmp_parallel_initialize();
__kmp_resume_if_soft_paused();
tid = __kmp_tid_from_gtid(global_tid);
if (tid == filter) {
KMP_COUNT_BLOCK(OMP_MASKED);
KMP_PUSH_PARTITIONED_TIMER(OMP_masked);
status = 1;
}
#if OMPT_SUPPORT && OMPT_OPTIONAL
if (status) {
if (ompt_enabled.ompt_callback_masked) {
kmp_info_t *this_thr = __kmp_threads[global_tid];
kmp_team_t *team = this_thr->th.th_team;
ompt_callbacks.ompt_callback(ompt_callback_masked)(
ompt_scope_begin, &(team->t.ompt_team_info.parallel_data),
&(team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_data),
OMPT_GET_RETURN_ADDRESS(0));
}
}
#endif
if (__kmp_env_consistency_check) {
#if KMP_USE_DYNAMIC_LOCK
if (status)
__kmp_push_sync(global_tid, ct_masked, loc, NULL, 0);
else
__kmp_check_sync(global_tid, ct_masked, loc, NULL, 0);
#else
if (status)
__kmp_push_sync(global_tid, ct_masked, loc, NULL);
else
__kmp_check_sync(global_tid, ct_masked, 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>masked</tt> region. This should only be called by the
thread that executes the <tt>masked</tt> region.
*/
void __kmpc_end_masked(ident_t *loc, kmp_int32 global_tid) {
KC_TRACE(10, ("__kmpc_end_masked: called T#%d\n", global_tid));
__kmp_assert_valid_gtid(global_tid);
KMP_POP_PARTITIONED_TIMER();
#if OMPT_SUPPORT && OMPT_OPTIONAL
kmp_info_t *this_thr = __kmp_threads[global_tid];
kmp_team_t *team = this_thr->th.th_team;
if (ompt_enabled.ompt_callback_masked) {
int tid = __kmp_tid_from_gtid(global_tid);
ompt_callbacks.ompt_callback(ompt_callback_masked)(
ompt_scope_end, &(team->t.ompt_team_info.parallel_data),
&(team->t.t_implicit_task_taskdata[tid].ompt_task_info.task_data),
OMPT_GET_RETURN_ADDRESS(0));
}
#endif
if (__kmp_env_consistency_check) {
__kmp_pop_sync(global_tid, ct_masked, 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));
__kmp_assert_valid_gtid(gtid);
if (!TCR_4(__kmp_init_parallel))
__kmp_parallel_initialize();
__kmp_resume_if_soft_paused();
#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_OPTIONAL
kmp_team_t *team;
ompt_wait_id_t lck;
void *codeptr_ra;
OMPT_STORE_RETURN_ADDRESS(gtid);
if (ompt_enabled.enabled) {
team = __kmp_team_from_gtid(gtid);
lck = (ompt_wait_id_t)(uintptr_t)&team->t.t_ordered.dt.t_value;
/* OMPT state update */
th->th.ompt_thread_info.wait_id = lck;
th->th.ompt_thread_info.state = ompt_state_wait_ordered;
/* OMPT event callback */
codeptr_ra = OMPT_LOAD_RETURN_ADDRESS(gtid);
if (ompt_enabled.ompt_callback_mutex_acquire) {
ompt_callbacks.ompt_callback(ompt_callback_mutex_acquire)(
ompt_mutex_ordered, omp_lock_hint_none, kmp_mutex_impl_spin, lck,
codeptr_ra);
}
}
#endif
if (th->th.th_dispatch->th_deo_fcn != 0)
(*th->th.th_dispatch->th_deo_fcn)(>id, &cid, loc);
else
__kmp_parallel_deo(>id, &cid, loc);
#if OMPT_SUPPORT && OMPT_OPTIONAL
if (ompt_enabled.enabled) {
/* OMPT state update */
th->th.ompt_thread_info.state = ompt_state_work_parallel;
th->th.ompt_thread_info.wait_id = 0;