X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fthread.h;h=f832c6be68c636b910a1e6f83172a0a8faaade00;hb=eac461c1f1ca91cfe282c779291d582ed6b336cb;hp=b8b99d3c07fd29b8c89b618eaa420a47e41976af;hpb=f3394087230720d0930f311e51a95d7fecb254e2;p=sbcl.git diff --git a/src/runtime/thread.h b/src/runtime/thread.h index b8b99d3..f832c6b 100644 --- a/src/runtime/thread.h +++ b/src/runtime/thread.h @@ -11,21 +11,73 @@ #ifdef LISP_FEATURE_GENCGC #include "gencgc-alloc-region.h" #endif +#ifdef LISP_FEATURE_WIN32 +#include "win32-thread-private-events.h" +#endif #include "genesis/symbol.h" #include "genesis/static-symbols.h" #include "genesis/thread.h" #include "genesis/fdefn.h" #include "interrupt.h" +#include "validate.h" /* for BINDING_STACK_SIZE etc */ #define STATE_RUNNING MAKE_FIXNUM(1) #define STATE_STOPPED MAKE_FIXNUM(2) #define STATE_DEAD MAKE_FIXNUM(3) +#if defined(LISP_FEATURE_SB_SAFEPOINT) +# define STATE_SUSPENDED_BRIEFLY MAKE_FIXNUM(4) +# define STATE_GC_BLOCKER MAKE_FIXNUM(5) +# define STATE_PHASE1_BLOCKER MAKE_FIXNUM(5) +# define STATE_PHASE2_BLOCKER MAKE_FIXNUM(6) +# define STATE_INTERRUPT_BLOCKER MAKE_FIXNUM(7) +#endif #ifdef LISP_FEATURE_SB_THREAD lispobj thread_state(struct thread *thread); void set_thread_state(struct thread *thread, lispobj state); void wait_for_thread_state_change(struct thread *thread, lispobj state); + +#if defined(LISP_FEATURE_SB_SAFEPOINT) +enum threads_suspend_reason { + SUSPEND_REASON_NONE, + SUSPEND_REASON_GC, + SUSPEND_REASON_INTERRUPT, + SUSPEND_REASON_GCING +}; + +struct threads_suspend_info { + int suspend; + pthread_mutex_t world_lock; + pthread_mutex_t lock; + enum threads_suspend_reason reason; + int phase; + struct thread * gc_thread; + struct thread * interrupted_thread; + int blockers; + int used_gc_page; +}; + +struct suspend_phase { + int suspend; + enum threads_suspend_reason reason; + int phase; + struct suspend_phase *next; +}; + +extern struct threads_suspend_info suspend_info; + +struct gcing_safety { + lispobj csp_around_foreign_call; + lispobj* pc_around_foreign_call; +}; + +int handle_safepoint_violation(os_context_t *context, os_vm_address_t addr); +void** os_get_csp(struct thread* th); +void alloc_gc_page(); +void assert_on_stack(struct thread *th, void *esp); +#endif /* defined(LISP_FEATURE_SB_SAFEPOINT) */ + extern pthread_key_t lisp_thread; #endif @@ -39,6 +91,57 @@ union per_thread_data { lispobj dynamic_values[1]; /* actually more like 4000 or so */ }; +/* A helper structure for data local to a thread, which is not pointer-sized. + * + * Originally, all layouting of these fields was done manually in C code + * with pointer arithmetic. We let the C compiler figure it out now. + * + * (Why is this not part of `struct thread'? Because that structure is + * declared using genesis, and we would run into issues with fields that + * are of unknown length.) + */ +struct nonpointer_thread_data +{ +#ifdef LISP_FEATURE_SB_THREAD + os_sem_t state_sem; + os_sem_t state_not_running_sem; + os_sem_t state_not_stopped_sem; +# ifdef LISP_FEATURE_SB_SAFEPOINT + /* For safepoint-based builds, together with thread's + * csp_around_foreign_call pointer target, thread_qrl(thread) makes + * `quickly revokable lock'. Unlike most mutexes, this one is + * normally locked; by convention, other thread may read and use the + * thread's FFI-CSP location _either_ when the former holds the + * lock(mutex) _or_ when page permissions for FFI-CSP location were + * set to read-only. + * + * Combined semantic of QRL is not the same as the semantic of mutex + * returned by this function; rather, the mutex, when released by the + * owning thread, provides an edge-triggered notification of QRL + * release, which is represented by writing non-null + * csp_around_foreign_call. + * + * When owner thread is `in Lisp' (i.e. a heap mutator), its FFI-CSP + * contains null, otherwise it points to the top of C stack that + * should be preserved by GENCGC. If another thread needs to wait for + * mutator state change with `in Lisp => in C' direction, it disables + * FFI-CSP overwrite using page protection, and takes the mutex + * returned by thread_qrl(). Page fault handler normally ends up in a + * routine releasing this mutex and waiting for some appropriate + * event to take it back. + * + * This way, each thread may modify its own FFI-CSP content freely + * without memory barriers (paying with exception handling overhead + * whenever a contention happens). */ + pthread_mutex_t qrl_lock; +# endif +#else + /* An unused field follows, to ensure that the struct in non-empty + * for non-GCC compilers. */ + int unused; +#endif +}; + extern struct thread *all_threads; extern int dynamic_values_bytes; @@ -177,6 +280,33 @@ StaticSymbolFunction(lispobj sym) extern __thread struct thread *current_thread; #endif +#ifdef LISP_FEATURE_SB_SAFEPOINT +# define THREAD_CSP_PAGE_SIZE BACKEND_PAGE_BYTES +#else +# define THREAD_CSP_PAGE_SIZE 0 +#endif + +#ifdef LISP_FEATURE_WIN32 +/* + * Win32 doesn't have SIGSTKSZ, and we're not switching stacks anyway, + * so define it arbitrarily + */ +#define SIGSTKSZ 1024 +#endif + +#define THREAD_STRUCT_SIZE (thread_control_stack_size + BINDING_STACK_SIZE + \ + ALIEN_STACK_SIZE + \ + sizeof(struct nonpointer_thread_data) + \ + dynamic_values_bytes + \ + 32 * SIGSTKSZ + \ + THREAD_ALIGNMENT_BYTES + \ + THREAD_CSP_PAGE_SIZE) + +#if defined(LISP_FEATURE_WIN32) +static inline struct thread* arch_os_get_current_thread() + __attribute__((__const__)); +#endif + /* This is clearly per-arch and possibly even per-OS code, but we can't * put it somewhere sensible like x86-linux-os.c because it needs too * much stuff like struct thread and all_threads to be defined, which @@ -187,6 +317,10 @@ static inline struct thread *arch_os_get_current_thread(void) #if defined(LISP_FEATURE_SB_THREAD) #if defined(LISP_FEATURE_X86) register struct thread *me=0; +#if defined(LISP_FEATURE_WIN32) && defined(LISP_FEATURE_SB_THREAD) + __asm__ ("movl %%fs:0xE10+(4*63), %0" : "=r"(me) :); + return me; +#endif if(all_threads) { #if defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_RESTORE_FS_SEGMENT_REGISTER_FROM_TLS) sel_t sel; @@ -212,7 +346,7 @@ static inline struct thread *arch_os_get_current_thread(void) #endif return th; #endif - __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me) + __asm__ ("movl %%fs:%c1,%0" : "=r" (me) : "i" (offsetof (struct thread,this))); } return me; @@ -229,10 +363,87 @@ static inline struct thread *arch_os_get_current_thread(void) } #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER) -#define THREAD_STRUCT_TO_EXCEPTION_PORT(th) ((mach_port_t) th) -#define EXCEPTION_PORT_TO_THREAD_STRUCT(th) ((struct thread *) th) +extern kern_return_t mach_lisp_thread_init(struct thread *thread); +extern kern_return_t mach_lisp_thread_destroy(struct thread *thread); +#endif + +#ifdef LISP_FEATURE_SB_SAFEPOINT +void thread_in_safety_transition(os_context_t *ctx); +void thread_in_lisp_raised(os_context_t *ctx); +void thread_interrupted(os_context_t *ctx); +void thread_pitstop(os_context_t *ctxptr); +extern void thread_register_gc_trigger(); + +# ifdef LISP_FEATURE_SB_THRUPTION +int wake_thread(os_thread_t os_thread); +# ifdef LISP_FEATURE_WIN32 +void wake_thread_win32(struct thread *thread); +# else +int wake_thread_posix(os_thread_t os_thread); +# endif +# endif + +#define thread_qrl(th) (&(th)->nonpointer_data->qrl_lock) + +static inline +void push_gcing_safety(struct gcing_safety *into) +{ + struct thread* th = arch_os_get_current_thread(); + asm volatile (""); + if ((into->csp_around_foreign_call = + *th->csp_around_foreign_call)) { + *th->csp_around_foreign_call = 0; + asm volatile (""); + into->pc_around_foreign_call = th->pc_around_foreign_call; + th->pc_around_foreign_call = 0; + asm volatile (""); + } else { + into->pc_around_foreign_call = 0; + } +} + +static inline +void pop_gcing_safety(struct gcing_safety *from) +{ + struct thread* th = arch_os_get_current_thread(); + if (from->csp_around_foreign_call) { + asm volatile (""); + *th->csp_around_foreign_call = from->csp_around_foreign_call; + asm volatile (""); + th->pc_around_foreign_call = from->pc_around_foreign_call; + asm volatile (""); + } +} + +/* Even with just -O1, gcc optimizes the jumps in this "loop" away + * entirely, giving the ability to define WITH-FOO-style macros. */ +#define RUN_BODY_ONCE(prefix, finally_do) \ + int prefix##done = 0; \ + for (; !prefix##done; finally_do, prefix##done = 1) + +#define WITH_GC_AT_SAFEPOINTS_ONLY_hygenic(var) \ + struct gcing_safety var; \ + push_gcing_safety(&var); \ + RUN_BODY_ONCE(var, pop_gcing_safety(&var)) + +#define WITH_GC_AT_SAFEPOINTS_ONLY() \ + WITH_GC_AT_SAFEPOINTS_ONLY_hygenic(sbcl__gc_safety) + +#define WITH_STATE_SEM_hygenic(var, thread) \ + os_sem_wait((thread)->state_sem, "thread_state"); \ + RUN_BODY_ONCE(var, os_sem_post((thread)->state_sem, "thread_state")) + +#define WITH_STATE_SEM(thread) \ + WITH_STATE_SEM_hygenic(sbcl__state_sem, thread) + +int check_pending_thruptions(os_context_t *ctx); + #endif extern void create_initial_thread(lispobj); +#ifdef LISP_FEATURE_SB_THREAD +extern pthread_mutex_t all_threads_lock; +#endif + #endif /* _INCLUDE_THREAD_H_ */