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Add maint set/show worker-threads

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This adds maint commands to control the number of worker threads that
gdb can use.

2019-11-26  Tom Tromey  <tom@tromey.com>

	* NEWS: Add entry.
	* maint.c (_initialize_maint_cmds): Add "worker-threads" maint
	commands.  Call update_thread_pool_size.
	(update_thread_pool_size, maintenance_set_worker_threads): New
	functions.
	(n_worker_threads): New global.

gdb/doc/ChangeLog
2019-11-26  Tom Tromey  <tom@tromey.com>

	* gdb.texinfo (Maintenance Commands): Document new maint
	commands.

Change-Id: I4fb514faa05879d8afe62c77036a4469d57dca2a
This commit is contained in:
Tom Tromey 2019-03-16 14:36:57 -06:00
parent d55c9a6847
commit 22138db609
5 changed files with 77 additions and 0 deletions
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41
gdb/maint.c
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@ -46,6 +46,10 @@
#include "cli/cli-setshow.h"
#include "cli/cli-cmds.h"
#if CXX_STD_THREAD
#include "gdbsupport/thread-pool.h"
#endif
static void maintenance_do_deprecate (const char *, int);
/* Access the maintenance subcommands. */
@ -840,6 +844,30 @@ maintenance_set_profile_cmd (const char *args, int from_tty,
error (_("Profiling support is not available on this system."));
}
#endif
static int n_worker_threads = -1;
/* Update the thread pool for the desired number of threads. */
static void
update_thread_pool_size ()
{
#if CXX_STD_THREAD
int n_threads = n_worker_threads;
if (n_threads < 0)
n_threads = std::thread::hardware_concurrency ();
gdb::thread_pool::g_thread_pool->set_thread_count (n_threads);
#endif
}
static void
maintenance_set_worker_threads (const char *args, int from_tty,
struct cmd_list_element *c)
{
update_thread_pool_size ();
}
/* If true, display time usage both at startup and for each command. */
@ -1313,4 +1341,17 @@ When enabled GDB is profiled."),
show_maintenance_profile_p,
&maintenance_set_cmdlist,
&maintenance_show_cmdlist);
add_setshow_zuinteger_unlimited_cmd ("worker-threads",
class_maintenance,
&n_worker_threads, _("\
Set the number of worker threads GDB can use."), _("\
Show the 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."),
maintenance_set_worker_threads, NULL,
&maintenance_set_cmdlist,
&maintenance_show_cmdlist);
update_thread_pool_size ();
}