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[gdb/dap] Make dap log printing thread-safe

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I read that printing from different python threads is thread-unsafe, and I
noticed that the dap log printing is used from different threads, but doesn't
take care to make the printing thread-safe.

Fix this by using a lock to access LoggingParam.log_file.

Tested on aarch64-linux.

Approved-By: Tom Tromey <tom@tromey.com>
This commit is contained in:
Tom de Vries
2024-02-21 10:46:08 +01:00
parent 84a227694d
commit d619334108
1 changed files with 16 additions and 12 deletions
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28
gdb/python/lib/gdb/dap/startup.py
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@@ -146,6 +146,7 @@ class LoggingParam(gdb.Parameter):
set_doc = "Set the DAP logging status."
show_doc = "Show the DAP logging status."
lock = threading.Lock()
log_file = None
def __init__(self):
@@ -155,12 +156,13 @@ class LoggingParam(gdb.Parameter):
self.value = None
def get_set_string(self):
# Close any existing log file, no matter what.
if self.log_file is not None:
self.log_file.close()
self.log_file = None
if self.value is not None:
self.log_file = open(self.value, "w")
with dap_log.lock:
# Close any existing log file, no matter what.
if self.log_file is not None:
self.log_file.close()
self.log_file = None
if self.value is not None:
self.log_file = open(self.value, "w")
return ""
@@ -169,16 +171,18 @@ dap_log = LoggingParam()
def log(something, level=LogLevel.DEFAULT):
"""Log SOMETHING to the log file, if logging is enabled."""
if dap_log.log_file is not None and level <= _log_level.value:
print(something, file=dap_log.log_file)
dap_log.log_file.flush()
with dap_log.lock:
if dap_log.log_file is not None and level <= _log_level.value:
print(something, file=dap_log.log_file)
dap_log.log_file.flush()
def log_stack(level=LogLevel.DEFAULT):
"""Log a stack trace to the log file, if logging is enabled."""
if dap_log.log_file is not None and level <= _log_level.value:
traceback.print_exc(file=dap_log.log_file)
dap_log.log_file.flush()
with dap_log.lock:
if dap_log.log_file is not None and level <= _log_level.value:
traceback.print_exc(file=dap_log.log_file)
dap_log.log_file.flush()
@in_gdb_thread