#include "os.h"
#ifdef LISP_FEATURE_GENCGC
#include "gencgc-alloc-region.h"
-#else
-struct alloc_region { };
#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_SUSPENDED (make_fixnum(2))
-#define STATE_DEAD (make_fixnum(3))
+#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);
-/* Only access thread state with blockables blocked. */
-static inline lispobj
-thread_state(struct thread *thread)
-{
- lispobj state;
- pthread_mutex_lock(thread->state_lock);
- state = thread->state;
- pthread_mutex_unlock(thread->state_lock);
- return state;
-}
+#if defined(LISP_FEATURE_SB_SAFEPOINT)
+enum threads_suspend_reason {
+ SUSPEND_REASON_NONE,
+ SUSPEND_REASON_GC,
+ SUSPEND_REASON_INTERRUPT,
+ SUSPEND_REASON_GCING
+};
-static inline void
-set_thread_state(struct thread *thread, lispobj state)
-{
- pthread_mutex_lock(thread->state_lock);
- thread->state = state;
- pthread_cond_broadcast(thread->state_cond);
- pthread_mutex_unlock(thread->state_lock);
-}
+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;
+};
-static inline void
-wait_for_thread_state_change(struct thread *thread, lispobj state)
-{
- pthread_mutex_lock(thread->state_lock);
- while (thread->state == state)
- pthread_cond_wait(thread->state_cond, thread->state_lock);
- pthread_mutex_unlock(thread->state_lock);
-}
+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
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;
#ifdef LISP_FEATURE_SB_THREAD
if(thread && sym->tls_index) {
lispobj *r = &(((union per_thread_data *)thread)
- ->dynamic_values[fixnum_value(sym->tls_index)]);
+ ->dynamic_values[(sym->tls_index) >> WORD_SHIFT]);
if((*r)!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
}
#endif
if(thread && sym->tls_index) {
lispobj r=
((union per_thread_data *)thread)
- ->dynamic_values[fixnum_value(sym->tls_index)];
+ ->dynamic_values[(sym->tls_index) >> WORD_SHIFT];
if(r!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
}
#endif
(pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
#ifdef LISP_FEATURE_SB_THREAD
return ((union per_thread_data *)thread)
- ->dynamic_values[fixnum_value(sym->tls_index)];
+ ->dynamic_values[(sym->tls_index) >> WORD_SHIFT];
#else
return sym->value;
#endif
#ifdef LISP_FEATURE_SB_THREAD
if(thread && sym->tls_index) {
lispobj *pr= &(((union per_thread_data *)thread)
- ->dynamic_values[fixnum_value(sym->tls_index)]);
+ ->dynamic_values[(sym->tls_index) >> WORD_SHIFT]);
if(*pr!=NO_TLS_VALUE_MARKER_WIDETAG) {
*pr=val;
return;
struct symbol *sym= (struct symbol *)
(pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
((union per_thread_data *)thread)
- ->dynamic_values[fixnum_value(sym->tls_index)]
+ ->dynamic_values[(sym->tls_index) >> WORD_SHIFT]
=val;
#else
SetSymbolValue(tagged_symbol_pointer,val,thread) ;
SymbolValue(BINDING_STACK_POINTER, thread)
#define set_binding_stack_pointer(thread,value) \
SetSymbolValue(BINDING_STACK_POINTER, (lispobj)(value), thread)
+#define access_control_stack_pointer(thread) \
+ (current_control_stack_pointer)
#else
#define get_binding_stack_pointer(thread) \
(current_binding_stack_pointer)
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
+
+#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)
+
/* 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
}
#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);
+int wake_thread_posix(os_thread_t os_thread);
+# 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 boolean is_some_thread_local_addr(os_vm_address_t addr);
extern void create_initial_thread(lispobj);
+#ifdef LISP_FEATURE_SB_THREAD
+extern pthread_mutex_t all_threads_lock;
+#endif
+
#endif /* _INCLUDE_THREAD_H_ */
projects / sbcl.git / blobdiff