libgomp: Add omp_in_explicit_task support

This is pretty straightforward, if gomp_thread ()->task is NULL,
it can't be explicit task, otherwise if
gomp_thread ()->task->kind == GOMP_TASK_IMPLICIT, it is an implicit
task, otherwise explicit task.

2022-10-12  Jakub Jelinek  <jakub@redhat.com>

	* omp.h.in (omp_in_explicit_task): Declare.
	* omp_lib.h.in (omp_in_explicit_task): Likewise.
	* omp_lib.f90.in (omp_in_explicit_task): New interface.
	* libgomp.map (OMP_5.2): New symbol version, export
	omp_in_explicit_task and omp_in_explicit_task_.
	* task.c (omp_in_explicit_task): New function.
	* fortran.c (omp_in_explicit_task): Add ialias_redirect.
	(omp_in_explicit_task_): New function.
	* libgomp.texi (OpenMP 5.2): Mark omp_in_explicit_task as implemented.
	* testsuite/libgomp.c-c++-common/task-in-explicit-1.c: New test.
	* testsuite/libgomp.c-c++-common/task-in-explicit-2.c: New test.
	* testsuite/libgomp.c-c++-common/task-in-explicit-3.c: New test.

1 files changed, 106 insertions, 0 deletions

diff --git a/libgomp/testsuite/libgomp.c-c++-common/task-in-explicit-1.c b/libgomp/testsuite/libgomp.c-c++-common/task-in-explicit-1.c
new file mode 100644
index 0000000..a228d93
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c-c++-common/task-in-explicit-1.c
@@ -0,0 +1,106 @@
+/* { dg-do run } */
+
+#include <omp.h>
+#include <stdlib.h>
+
+int
+main ()
+{
+  if (omp_in_explicit_task ())
+    abort ();
+  #pragma omp task
+  if (!omp_in_explicit_task ())
+    abort ();
+  #pragma omp task final (1)
+  {
+    if (!omp_in_explicit_task ())
+      abort ();
+    #pragma omp task 
+    if (!omp_in_explicit_task ())
+      abort ();
+  }
+  #pragma omp parallel
+  {
+    if (omp_in_explicit_task ())
+      abort ();
+    #pragma omp task if (0)
+      {
+	if (!omp_in_explicit_task ())
+	  abort ();
+	#pragma omp task if (0)
+	  if (!omp_in_explicit_task ())
+	    abort ();
+      }
+    #pragma omp task final (1)
+      if (!omp_in_explicit_task ())
+	abort ();
+    #pragma omp barrier
+    if (omp_in_explicit_task ())
+      abort ();
+    #pragma omp taskloop num_tasks (24)
+    for (int i = 0; i < 32; ++i)
+      if (!omp_in_explicit_task ())
+	abort ();
+    #pragma omp masked
+    #pragma omp task
+    if (!omp_in_explicit_task ())
+      abort ();
+    #pragma omp barrier
+    if (omp_in_explicit_task ())
+      abort ();
+  }
+  #pragma omp target
+  {
+    if (omp_in_explicit_task ())
+      abort ();
+    #pragma omp task if (0)
+    if (!omp_in_explicit_task ())
+      abort ();
+    #pragma omp task
+    if (!omp_in_explicit_task ())
+      abort ();
+  }
+  #pragma omp target teams
+  {
+    #pragma omp distribute
+    for (int i = 0; i < 4; ++i)
+      if (omp_in_explicit_task ())
+	abort ();
+      else
+	{
+	  #pragma omp parallel
+	  {
+	    if (omp_in_explicit_task ())
+	      abort ();
+	    #pragma omp task
+	    if (!omp_in_explicit_task ())
+	      abort ();
+	    #pragma omp barrier
+	    if (omp_in_explicit_task ())
+	      abort ();
+	  }
+	}
+  }
+  #pragma omp teams
+  {
+    #pragma omp distribute
+    for (int i = 0; i < 4; ++i)
+      if (omp_in_explicit_task ())
+	abort ();
+      else
+	{
+	  #pragma omp parallel
+	  {
+	    if (omp_in_explicit_task ())
+	      abort ();
+	    #pragma omp task
+	    if (!omp_in_explicit_task ())
+	      abort ();
+	    #pragma omp barrier
+	    if (omp_in_explicit_task ())
+	      abort ();
+	  }
+	}
+  }
+  return 0;
+}