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WIP switch to special mutex for syncing halts

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This commit is contained in:
Nikita Smith
2025-11-19 13:01:25 -08:00
parent b7fb4fe04d
commit 533e7431e7
2 changed files with 12 additions and 13 deletions
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src/demon/linux/demon_core_linux.c
+11 -12
View File
@@ -2018,6 +2018,7 @@ dmn_init(void)
dmn_lnx_state->entities_base = push_array(dmn_lnx_state->entities_arena, DMN_LNX_Entity, 0);
dmn_lnx_state->tid_ht = hash_table_init(dmn_lnx_state->arena, 0x2000);
dmn_lnx_state->pid_ht = hash_table_init(dmn_lnx_state->arena, 0x400);
dmn_lnx_state->halter_mutex = mutex_alloc();
dmn_lnx_entity_alloc(dmn_lnx_nil_entity, DMN_LNX_EntityKind_Root);
}
@@ -2181,10 +2182,11 @@ dmn_ctrl_detach(DMN_CtrlCtx *ctx, DMN_Handle process)
internal DMN_EventList
dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
{
Assert(gettid() == dmn_lnx_state->tracer_tid);
Temp scratch = scratch_begin(&arena, 1);
DMN_EventList events = {0};
dmn_access_open();
mutex_take(dmn_lnx_state->halter_mutex);
// write traps to memory
DMN_ActiveTrap *active_trap_first = 0, *active_trap_last = 0;
@@ -2270,8 +2272,7 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
for(DMN_LNX_Entity *thread = process->first; thread != dmn_lnx_nil_entity; thread = thread->next)
{
if(thread->kind != DMN_LNX_EntityKind_Thread) { continue; }
if(thread->thread_state == DMN_LNX_ThreadState_WaitForVFrok) { continue; }
if(thread->kind != DMN_LNX_EntityKind_Thread) { continue; }
//- rjf: determine if this thread is frozen
B32 is_frozen = 0;
@@ -2369,7 +2370,7 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
break;
}
dmn_access_close();
mutex_drop(dmn_lnx_state->halter_mutex);
// wait for a signal
int status = 0;
@@ -2381,7 +2382,7 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
break;
}
dmn_access_open();
mutex_take(dmn_lnx_state->halter_mutex);
// unpack status
int wifexited = WIFEXITED(status);
@@ -2623,7 +2624,7 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
}
}
dmn_access_close();
mutex_drop(dmn_lnx_state->halter_mutex);
scratch_end(scratch);
return events;
}
@@ -2634,9 +2635,8 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
internal void
dmn_halt(U64 code, U64 user_data)
{
dmn_ctrl_exclusive_access_begin();
if(!dmn_lnx_state->is_halting && dmn_lnx_state->active_process_count > 0)
mutex_take(dmn_lnx_state->halter_mutex);
if(dmn_lnx_state->active_process_count)
{
dmn_lnx_state->halter_tid = gettid();
dmn_lnx_state->halt_code = code;
@@ -2647,8 +2647,7 @@ dmn_halt(U64 code, U64 user_data)
if(OS_LNX_RETRY_ON_EINTR(kill(process->id, SIGSTOP)) < 0) { Assert(0 && "failed to send SIGSTOP"); }
}
}
dmn_ctrl_exclusive_access_end();
mutex_drop(dmn_lnx_state->halter_mutex);
}
////////////////////////////////
src/demon/linux/demon_core_linux.h
+1 -1
View File
@@ -164,7 +164,6 @@ typedef enum DMN_LNX_ThreadState
DMN_LNX_ThreadState_Running,
DMN_LNX_ThreadState_Stopped,
DMN_LNX_ThreadState_Exited,
DMN_LNX_ThreadState_WaitForVFrok,
} DMN_LNX_ThreadState;
typedef struct DMN_LNX_Entity DMN_LNX_Entity;
@@ -288,6 +287,7 @@ struct DMN_LNX_State
DMN_LNX_ProcessLaunchList free_pids;
// halter
Mutex halter_mutex;
pid_t halter_tid;
U64 halt_code;
U64 halt_user_data;