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#include "config.h"
#include "tasklets.h"
#include "mono/metadata/exception.h"
#include "mono/metadata/gc-internal.h"
#include "mini.h"
#if defined(MONO_SUPPORT_TASKLETS)
/* keepalive_stacks could be a per-stack var to avoid locking overhead */
static MonoGHashTable *keepalive_stacks = NULL;
static CRITICAL_SECTION tasklets_mutex;
#define tasklets_lock() EnterCriticalSection(&tasklets_mutex)
#define tasklets_unlock() LeaveCriticalSection(&tasklets_mutex)
/* LOCKING: tasklets_mutex is assumed to e taken */
static void
internal_init (void)
{
if (keepalive_stacks)
return;
MONO_GC_REGISTER_ROOT_PINNING (keepalive_stacks);
keepalive_stacks = mono_g_hash_table_new (NULL, NULL);
}
static void*
continuation_alloc (void)
{
MonoContinuation *cont = g_new0 (MonoContinuation, 1);
return cont;
}
static void
continuation_free (MonoContinuation *cont)
{
if (cont->saved_stack) {
tasklets_lock ();
mono_g_hash_table_remove (keepalive_stacks, cont->saved_stack);
tasklets_unlock ();
mono_gc_free_fixed (cont->saved_stack);
}
g_free (cont);
}
static MonoException*
continuation_mark_frame (MonoContinuation *cont)
{
MonoJitTlsData *jit_tls;
MonoLMF *lmf;
MonoContext ctx, new_ctx;
MonoJitInfo *ji, rji;
int endloop = FALSE;
if (cont->domain)
return mono_get_exception_argument ("cont", "Already marked");
jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
lmf = mono_get_lmf();
cont->domain = mono_domain_get ();
cont->thread_id = GetCurrentThreadId ();
/* get to the frame that called Mark () */
memset (&rji, 0, sizeof (rji));
do {
ji = mono_find_jit_info (cont->domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
if (!ji || ji == (gpointer)-1) {
return mono_get_exception_not_supported ("Invalid stack frame");
}
ctx = new_ctx;
if (endloop)
break;
if (strcmp (ji->method->name, "Mark") == 0)
endloop = TRUE;
} while (1);
cont->top_sp = MONO_CONTEXT_GET_SP (&ctx);
/*g_print ("method: %s, sp: %p\n", ji->method->name, cont->top_sp);*/
return NULL;
}
static int
continuation_store (MonoContinuation *cont, int state, MonoException **e)
{
MonoLMF *lmf = mono_get_lmf ();
gsize num_bytes;
if (!cont->domain) {
*e = mono_get_exception_argument ("cont", "Continuation not initialized");
return 0;
}
if (cont->domain != mono_domain_get () || cont->thread_id != GetCurrentThreadId ()) {
*e = mono_get_exception_argument ("cont", "Continuation from another thread or domain");
return 0;
}
cont->lmf = lmf;
cont->return_ip = __builtin_return_address (0);
cont->return_sp = __builtin_frame_address (0);
num_bytes = (char*)cont->top_sp - (char*)cont->return_sp;
/*g_print ("store: %d bytes, sp: %p, ip: %p, lmf: %p\n", num_bytes, cont->return_sp, cont->return_ip, lmf);*/
if (cont->saved_stack && num_bytes <= cont->stack_alloc_size) {
/* clear to avoid GC retention */
if (num_bytes < cont->stack_used_size) {
memset ((char*)cont->saved_stack + num_bytes, 0, cont->stack_used_size - num_bytes);
}
cont->stack_used_size = num_bytes;
} else {
tasklets_lock ();
internal_init ();
if (cont->saved_stack) {
mono_g_hash_table_remove (keepalive_stacks, cont->saved_stack);
mono_gc_free_fixed (cont->saved_stack);
}
cont->stack_used_size = num_bytes;
cont->stack_alloc_size = num_bytes * 1.1;
cont->saved_stack = mono_gc_alloc_fixed (cont->stack_alloc_size, NULL);
mono_g_hash_table_insert (keepalive_stacks, cont->saved_stack, cont->saved_stack);
tasklets_unlock ();
}
memcpy (cont->saved_stack, cont->return_sp, num_bytes);
return state;
}
static MonoException*
continuation_restore (MonoContinuation *cont, int state)
{
MonoLMF **lmf_addr = mono_get_lmf_addr ();
MonoContinuationRestore restore_state = mono_tasklets_arch_restore ();
if (!cont->domain || !cont->return_sp)
return mono_get_exception_argument ("cont", "Continuation not initialized");
if (cont->domain != mono_domain_get () || cont->thread_id != GetCurrentThreadId ())
return mono_get_exception_argument ("cont", "Continuation from another thread or domain");
/*g_print ("restore: %p, state: %d\n", cont, state);*/
*lmf_addr = cont->lmf;
restore_state (cont, state, lmf_addr);
g_assert_not_reached ();
}
void
mono_tasklets_init (void)
{
InitializeCriticalSection (&tasklets_mutex);
mono_add_internal_call ("Mono.Tasklets.Continuation::alloc", continuation_alloc);
mono_add_internal_call ("Mono.Tasklets.Continuation::free", continuation_free);
mono_add_internal_call ("Mono.Tasklets.Continuation::mark", continuation_mark_frame);
mono_add_internal_call ("Mono.Tasklets.Continuation::store", continuation_store);
mono_add_internal_call ("Mono.Tasklets.Continuation::restore", continuation_restore);
}
void
mono_tasklets_cleanup (void)
{
}
#endif
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