Add maint set/show max-worker-threads
This adds maint commands to control the maximum number of worker
threads that gdb can use.
2019-09-30 Tom Tromey <tom@tromey.com>
* NEWS: Add entry.
* maint.c (_initialize_maint_cmds): Add "max-worker-threads" maint
commands.
gdb/doc/ChangeLog
2019-09-30 Tom Tromey <tom@tromey.com>
* gdb.texinfo (Maintenance Commands): Document new maint
commands.
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e2b91c6..d7407a3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,11 @@
2019-09-30 Tom Tromey <tom@tromey.com>
+ * NEWS: Add entry.
+ * maint.c (_initialize_maint_cmds): Add "max-worker-threads" maint
+ commands.
+
+2019-09-30 Tom Tromey <tom@tromey.com>
+
* minsyms.c (minimal_symbol_reader::install): Use
parallel_for_each.
* gdbsupport/parallel-for.h: New file.
diff --git a/gdb/NEWS b/gdb/NEWS
index 779fd91..7d4988f 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -122,6 +122,12 @@
set style highlight intensity VALUE
Control the styling of highlightings.
+maint set max-worker-threads
+maint show max-worker-threads
+ Control the maximum number of worker threads that can be used by GDB.
+ The default is "unlimited". Currently worker threads are only used when
+ demangling the names of linker symbols.
+
maint set test-settings KIND
maint show test-settings KIND
A set of commands used by the testsuite for exercising the settings
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index 0a10fa3..eef81f0 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,8 @@
+2019-09-30 Tom Tromey <tom@tromey.com>
+
+ * gdb.texinfo (Maintenance Commands): Document new maint
+ commands.
+
2019-09-20 Ulrich Weigand <uweigand@de.ibm.com>
* doc/gdb.texinfo (Remote Configuration): Remove documentation for
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index f2713c0..04a4009 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -37663,6 +37663,20 @@
If DWARF frame unwinders are not supported for a particular target
architecture, then enabling this flag does not cause them to be used.
+
+@kindex maint set max-worker-threads
+@kindex maint show max-worker-threads
+@item maint set max-worker-threads
+@item maint show max-worker-threads
+Control the number of worker threads that may be used by @value{GDBN}.
+On capable hosts, @value{GDBN} may use multiple threads to speed up
+certain CPU-intensive operations, such as demangling symbol names.
+While the number of threads used by @value{GDBN} may vary, this
+command can be used to set an upper bound on this number. The default
+is @code{unlimited}. Note that this only controls worker threads
+started by @value{GDBN} itself; libraries used by @value{GDBN} may
+start threads of their own.
+
@kindex maint set profile
@kindex maint show profile
@cindex profiling GDB
diff --git a/gdb/maint.c b/gdb/maint.c
index ec9f4ab..8428bea 100644
--- a/gdb/maint.c
+++ b/gdb/maint.c
@@ -40,6 +40,7 @@
#include "top.h"
#include "maint.h"
#include "gdbsupport/selftest.h"
+#include "gdbsupport/parallel-for.h"
#include "cli/cli-decode.h"
#include "cli/cli-utils.h"
@@ -1312,4 +1313,15 @@
show_maintenance_profile_p,
&maintenance_set_cmdlist,
&maintenance_show_cmdlist);
+
+ add_setshow_zuinteger_unlimited_cmd ("max-worker-threads",
+ class_maintenance,
+ &gdb::max_threads, _("\
+Set the maximum number of worker threads GDB can use."), _("\
+Set the maximum number of worker threads GDB can use."), _("\
+GDB may use multiple threads to speed up certain CPU-intensive operations,\n\
+such as demangling symbol names."),
+ NULL, NULL,
+ &maintenance_set_cmdlist,
+ &maintenance_show_cmdlist);
}
