diff options
Diffstat (limited to 'arch/um/os-Linux/signal.c')
| -rw-r--r-- | arch/um/os-Linux/signal.c | 46 |
1 files changed, 39 insertions, 7 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index 11f07f498270..327fb3c52fc7 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -20,6 +20,7 @@ #include <um_malloc.h> #include <sys/ucontext.h> #include <timetravel.h> +#include "internal.h" void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *, void *mc) = { [SIGTRAP] = relay_signal, @@ -68,12 +69,12 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc) #define SIGCHLD_BIT 2 #define SIGCHLD_MASK (1 << SIGCHLD_BIT) -int signals_enabled; +__thread int signals_enabled; #if IS_ENABLED(CONFIG_UML_TIME_TRAVEL_SUPPORT) static int signals_blocked, signals_blocked_pending; #endif -static unsigned int signals_pending; -static unsigned int signals_active = 0; +static __thread unsigned int signals_pending; +static __thread unsigned int signals_active; static void sig_handler(int sig, struct siginfo *si, mcontext_t *mc) { @@ -159,6 +160,11 @@ void timer_set_signal_handler(void) set_handler(SIGALRM); } +int timer_alarm_pending(void) +{ + return !!(signals_pending & SIGALRM_MASK); +} + void set_sigstack(void *sig_stack, int size) { stack_t stack = { @@ -253,9 +259,29 @@ int change_sig(int signal, int on) return 0; } -void block_signals(void) +static inline void __block_signals(void) { + if (!signals_enabled) + return; + + os_local_ipi_disable(); + barrier(); signals_enabled = 0; +} + +static inline void __unblock_signals(void) +{ + if (signals_enabled) + return; + + signals_enabled = 1; + barrier(); + os_local_ipi_enable(); +} + +void block_signals(void) +{ + __block_signals(); /* * This must return with signals disabled, so this barrier * ensures that writes are flushed out before the return. @@ -272,7 +298,8 @@ void unblock_signals(void) if (signals_enabled == 1) return; - signals_enabled = 1; + __unblock_signals(); + #if IS_ENABLED(CONFIG_UML_TIME_TRAVEL_SUPPORT) deliver_time_travel_irqs(); #endif @@ -306,7 +333,7 @@ void unblock_signals(void) * tracing that happens inside the handlers we call for the * pending signals will mess up the tracing state. */ - signals_enabled = 0; + __block_signals(); um_trace_signals_off(); /* @@ -338,10 +365,15 @@ void unblock_signals(void) /* Re-enable signals and trace that we're doing so. */ um_trace_signals_on(); - signals_enabled = 1; + __unblock_signals(); } } +int um_get_signals(void) +{ + return signals_enabled; +} + int um_set_signals(int enable) { int ret; |