fix: use atomic loads for clip state and buffer_size in engine_process_commands

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

engine.c

@@ -473,8 +473,8 @@ void engine_process_commands(Engine *engine) {
                 action.type = ACTION_TRIGGER_CLIP;
                 action.index = cmd.index;
                 action.value = 0;
-                action.previous_state = clip->state;
-                action.previous_buffer_size = clip->buffer_size;
+                action.previous_state = (ClipState)atomic_load(&clip->state);
+                action.previous_buffer_size = (size_t)atomic_load(&clip->buffer_size);
                 action.previous_write_position = clip->write_position;
                 action.previous_read_position = clip->read_position;
                 engine_push_undo_action(engine, &action);
@@ -566,8 +566,8 @@ void engine_process_commands(Engine *engine) {
                 action.type = ACTION_RESET_CLIP;
                 action.index = cmd.index;
                 action.value = 0;
-                action.previous_state = clip->state;
-                action.previous_buffer_size = clip->buffer_size;
+                action.previous_state = (ClipState)atomic_load(&clip->state);
+                action.previous_buffer_size = (size_t)atomic_load(&clip->buffer_size);
                 action.previous_write_position = clip->write_position;
                 action.previous_read_position = clip->read_position;
                 engine_push_undo_action(engine, &action);

err.log

@@ -0,0 +1,47 @@
+JACK Looper started
+Client name: jack-looper
+Control channel: 0
+Sample rate: 48000 Hz
+Press Ctrl+C to stop
+
+[?1049h(B[?7h[?1h[?25l[?1000h                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               [?7l [?7h(BJACK Looper - 8x8 Clip Grid(B        0     1     2     3     4     5     6     7      8     9    10    11    12    13    14    1516    17    18    19    20    21    22    2324    25    26    27    28    29    30    3132    33    34    35    36    37    38    3940    41    42    43    44    45    46    4748    49    50    51    52    53    54    5556    57    58    59    60    61    62    63  (B[?1000l[?12h[?25h
+[?1049l
+[?1l==================
+WARNING: ThreadSanitizer: data race (pid=925560)
+  Write of size 1 at 0x55e2d55c4e20 by main thread:
+    #0 engine_stop_save_load_thread /home/jt/code/wheelie/engine.c:400 (jack-looper+0x4d6a) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+    #1 engine_stop /home/jt/code/wheelie/engine.c:1115 (jack-looper+0x9883) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+    #2 main /home/jt/code/wheelie/main.c:108 (jack-looper+0x2b6c) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+
+  Previous read of size 1 at 0x55e2d55c4e20 by thread T5:
+    #0 save_load_thread_func /home/jt/code/wheelie/engine.c:303 (jack-looper+0x4c43) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+    #1 <null> <null> (libtsan.so.2+0x541b9) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+
+  Location is global 'engine' of size 39432 at 0x55e2d55bb420 (jack-looper+0x24e20)
+
+  Thread T5 (tid=925567, running) created by main thread at:
+    #0 pthread_create <null> (libtsan.so.2+0x5fb47) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 engine_start_save_load_thread /home/jt/code/wheelie/engine.c:388 (jack-looper+0x4cff) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+    #2 engine_start /home/jt/code/wheelie/engine.c:1101 (jack-looper+0x979f) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+    #3 main /home/jt/code/wheelie/main.c:79 (jack-looper+0x2a25) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+
+SUMMARY: ThreadSanitizer: data race /home/jt/code/wheelie/engine.c:400 in engine_stop_save_load_thread
+==================
+==================
+WARNING: ThreadSanitizer: unlock of an unlocked mutex (or by a wrong thread) (pid=925560)
+    #0 pthread_mutex_unlock <null> (libtsan.so.2+0x5c2ec) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0xd250) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+
+  Location is heap block of size 1512 at 0x726800001200 allocated by main thread:
+    #0 calloc <null> (libtsan.so.2+0x9126c) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0x6bbef) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x2999) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+
+  Mutex M0 (0x726800001710) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libspa-support.so+0x8bd0) (BuildId: 24a3df4fe9996f17f516f9dca3d5b18bfce2133f)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x2999) (BuildId: 1db9d60d6df5722c162e756ee0458e30040c8571)
+
+SUMMARY: ThreadSanitizer: unlock of an unlocked mutex (or by a wrong thread) (/usr/lib/libpipewire-0.3.so.0+0xd250) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106) 
+==================
+

tsan_report.log

@@ -0,0 +1,82 @@
+==================
+WARNING: ThreadSanitizer: unlock of an unlocked mutex (or by a wrong thread) (pid=928821)
+    #0 pthread_mutex_unlock <null> (libtsan.so.2+0x5c2ec) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0xd250) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+
+  Location is heap block of size 1512 at 0x726800001200 allocated by main thread:
+    #0 calloc <null> (libtsan.so.2+0x9126c) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0x6bbef) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Mutex M0 (0x726800001710) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libspa-support.so+0x8bd0) (BuildId: 24a3df4fe9996f17f516f9dca3d5b18bfce2133f)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+SUMMARY: ThreadSanitizer: unlock of an unlocked mutex (or by a wrong thread) (/usr/lib/libpipewire-0.3.so.0+0xd250) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106) 
+==================
+==================
+WARNING: ThreadSanitizer: data race (pid=928821)
+  Read of size 8 at 0x5598ba988108 by thread T4 (mutexes: write M0, write M1):
+    #0 engine_process_commands /home/jt/code/wheelie/engine.c:453 (jack-looper+0x64b4) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 process_callback /home/jt/code/wheelie/engine.c:24 (jack-looper+0x3c4f) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 <null> <null> (libjack.so.0+0x1fc6a) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+
+  Previous write of size 4 at 0x5598ba988108 by main thread:
+    #0 engine_submit_command /home/jt/code/wheelie/engine.c:429 (jack-looper+0x62ad) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 engine_transport_toggle_play /home/jt/code/wheelie/engine.c:1176 (jack-looper+0xb9dd) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 tui_run /home/jt/code/wheelie/tui.c:694 (jack-looper+0xe81e) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #3 main /home/jt/code/wheelie/main.c:95 (jack-looper+0x3b86) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Location is global 'engine' of size 39432 at 0x5598ba987440 (jack-looper+0x21108)
+
+  Mutex M0 (0x726800001710) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libspa-support.so+0x8bd0) (BuildId: 24a3df4fe9996f17f516f9dca3d5b18bfce2133f)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Mutex M1 (0x728400000550) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 jack_client_open <null> (libjack.so.0+0x1d691) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Thread T4 'data-loop.0' (tid=928826, running) created by main thread at:
+    #0 pthread_create <null> (libtsan.so.2+0x5fb47) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0x90c47) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+    #2 main /home/jt/code/wheelie/main.c:79 (jack-looper+0x3a85) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+SUMMARY: ThreadSanitizer: data race /home/jt/code/wheelie/engine.c:453 in engine_process_commands
+==================
+==================
+WARNING: ThreadSanitizer: data race (pid=928821)
+  Read of size 4 at 0x5598ba988114 by thread T4 (mutexes: write M0, write M1):
+    #0 engine_process_commands /home/jt/code/wheelie/engine.c:453 (jack-looper+0x64b4) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 process_callback /home/jt/code/wheelie/engine.c:24 (jack-looper+0x3c4f) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 <null> <null> (libjack.so.0+0x1fc6a) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+
+  Previous write of size 4 at 0x5598ba988114 by main thread:
+    #0 engine_submit_command /home/jt/code/wheelie/engine.c:429 (jack-looper+0x62ad) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 engine_reset_clip /home/jt/code/wheelie/engine.c:1137 (jack-looper+0xb748) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 tui_run /home/jt/code/wheelie/tui.c:644 (jack-looper+0xe62a) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #3 main /home/jt/code/wheelie/main.c:95 (jack-looper+0x3b86) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Location is global 'engine' of size 39432 at 0x5598ba987440 (jack-looper+0x21114)
+
+  Mutex M0 (0x726800001710) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libspa-support.so+0x8bd0) (BuildId: 24a3df4fe9996f17f516f9dca3d5b18bfce2133f)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Mutex M1 (0x728400000550) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 jack_client_open <null> (libjack.so.0+0x1d691) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Thread T4 'data-loop.0' (tid=928826, running) created by main thread at:
+    #0 pthread_create <null> (libtsan.so.2+0x5fb47) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0x90c47) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+    #2 main /home/jt/code/wheelie/main.c:79 (jack-looper+0x3a85) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+SUMMARY: ThreadSanitizer: data race /home/jt/code/wheelie/engine.c:453 in engine_process_commands
+==================
+ThreadSanitizer: reported 3 warnings

tsan_report.log.928888

@@ -0,0 +1,65 @@
+==================
+WARNING: ThreadSanitizer: data race (pid=928888)
+  Read of size 4 at 0x56251621f114 by thread T4 (mutexes: write M0, write M1):
+    #0 engine_process_commands /home/jt/code/wheelie/engine.c:453 (jack-looper+0x64b4) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 process_callback /home/jt/code/wheelie/engine.c:24 (jack-looper+0x3c4f) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 <null> <null> (libjack.so.0+0x1fc6a) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+
+  Previous write of size 4 at 0x56251621f114 by main thread:
+    #0 engine_submit_command /home/jt/code/wheelie/engine.c:429 (jack-looper+0x62ad) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 engine_reset_clip /home/jt/code/wheelie/engine.c:1137 (jack-looper+0xb748) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 tui_run /home/jt/code/wheelie/tui.c:644 (jack-looper+0xe62a) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #3 main /home/jt/code/wheelie/main.c:95 (jack-looper+0x3b86) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Location is global 'engine' of size 39432 at 0x56251621e440 (jack-looper+0x21114)
+
+  Mutex M0 (0x726800001710) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libspa-support.so+0x8bd0) (BuildId: 24a3df4fe9996f17f516f9dca3d5b18bfce2133f)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Mutex M1 (0x728400000550) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 jack_client_open <null> (libjack.so.0+0x1d691) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Thread T4 'data-loop.0' (tid=928893, running) created by main thread at:
+    #0 pthread_create <null> (libtsan.so.2+0x5fb47) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0x90c47) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+    #2 main /home/jt/code/wheelie/main.c:79 (jack-looper+0x3a85) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+SUMMARY: ThreadSanitizer: data race /home/jt/code/wheelie/engine.c:453 in engine_process_commands
+==================
+==================
+WARNING: ThreadSanitizer: data race (pid=928888)
+  Read of size 8 at 0x56251621f120 by thread T4 (mutexes: write M0, write M1):
+    #0 engine_process_commands /home/jt/code/wheelie/engine.c:453 (jack-looper+0x64b4) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 process_callback /home/jt/code/wheelie/engine.c:24 (jack-looper+0x3c4f) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 <null> <null> (libjack.so.0+0x1fc6a) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+
+  Previous write of size 4 at 0x56251621f120 by main thread:
+    #0 engine_submit_command /home/jt/code/wheelie/engine.c:429 (jack-looper+0x62ad) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #1 engine_transport_toggle_play /home/jt/code/wheelie/engine.c:1176 (jack-looper+0xb9dd) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #2 tui_run /home/jt/code/wheelie/tui.c:694 (jack-looper+0xe81e) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+    #3 main /home/jt/code/wheelie/main.c:95 (jack-looper+0x3b86) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Location is global 'engine' of size 39432 at 0x56251621e440 (jack-looper+0x21120)
+
+  Mutex M0 (0x726800001710) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libspa-support.so+0x8bd0) (BuildId: 24a3df4fe9996f17f516f9dca3d5b18bfce2133f)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Mutex M1 (0x728400000550) created at:
+    #0 pthread_mutex_init <null> (libtsan.so.2+0x5e23a) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 jack_client_open <null> (libjack.so.0+0x1d691) (BuildId: a070bcfa4955ac5fd8a632489cd56f534a7dfc66)
+    #2 main /home/jt/code/wheelie/main.c:67 (jack-looper+0x39f9) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+  Thread T4 'data-loop.0' (tid=928893, running) created by main thread at:
+    #0 pthread_create <null> (libtsan.so.2+0x5fb47) (BuildId: f29521f558650bcc384c0178d8c6d0fd49466e29)
+    #1 <null> <null> (libpipewire-0.3.so.0+0x90c47) (BuildId: 6c351c9a14f26a16201ad1530bbec8bc2bdf8106)
+    #2 main /home/jt/code/wheelie/main.c:79 (jack-looper+0x3a85) (BuildId: ed86a50eccffb9d745f9683ba76a2748ef793573)
+
+SUMMARY: ThreadSanitizer: data race /home/jt/code/wheelie/engine.c:453 in engine_process_commands
+==================
+ThreadSanitizer: reported 2 warnings