mirror of
https://github.com/janet-lang/janet
synced 2024-06-13 17:06:49 +00:00
160dd830a0
This would allow an embedder to suspend the current Janet fiber via an external event like a signal, other thread, or really anything. This is a useful primitive for custom schedulers that would call janet_interpreter_interupt periodically (say, in an interval with SIG_ALRM), do some work, and then use janet_continue on the janet_root_fiber, or for embedding into other soft-realtime applications like a game. To say, only allow about 5ms per frame of interpreter time.
181 lines
4.5 KiB
C
181 lines
4.5 KiB
C
/*
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* Copyright (c) 2021 Calvin Rose
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef JANET_STATE_H_defined
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#define JANET_STATE_H_defined
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#include <stdint.h>
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typedef int64_t JanetTimestamp;
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typedef struct JanetScratch {
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JanetScratchFinalizer finalize;
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long long mem[]; /* for proper alignment */
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} JanetScratch;
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typedef struct {
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JanetGCObject *self;
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JanetGCObject *other;
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int32_t index;
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int32_t index2;
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} JanetTraversalNode;
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typedef struct {
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int32_t capacity;
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int32_t head;
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int32_t tail;
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void *data;
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} JanetQueue;
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typedef struct {
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JanetTimestamp when;
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JanetFiber *fiber;
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JanetFiber *curr_fiber;
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uint32_t sched_id;
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int is_error;
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} JanetTimeout;
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#ifdef JANET_THREADS
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typedef struct {
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JanetMailbox *original;
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JanetMailbox *newbox;
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uint64_t flags;
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} JanetMailboxPair;
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#endif
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struct JanetVM {
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/* Top level dynamic bindings */
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JanetTable *top_dyns;
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/* Cache the core environment */
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JanetTable *core_env;
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/* How many VM stacks have been entered */
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int stackn;
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/* If this flag is true, suspend on function calls and backwards jumps.
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* When this occurs, this flag will be reset to 0. */
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int auto_suspend;
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/* The current running fiber on the current thread.
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* Set and unset by janet_run. */
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JanetFiber *fiber;
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JanetFiber *root_fiber;
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/* The current pointer to the inner most jmp_buf. The current
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* return point for panics. */
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jmp_buf *signal_buf;
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Janet *return_reg;
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/* The global registry for c functions. Used to store meta-data
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* along with otherwise bare c function pointers. */
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JanetTable *registry;
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/* Registry for abstract abstract types that can be marshalled.
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* We need this to look up the constructors when unmarshalling. */
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JanetTable *abstract_registry;
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/* Immutable value cache */
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const uint8_t **cache;
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uint32_t cache_capacity;
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uint32_t cache_count;
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uint32_t cache_deleted;
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uint8_t gensym_counter[8];
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/* Garbage collection */
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void *blocks;
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size_t gc_interval;
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size_t next_collection;
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size_t block_count;
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int gc_suspend;
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/* GC roots */
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Janet *roots;
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size_t root_count;
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size_t root_capacity;
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/* Scratch memory */
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JanetScratch **scratch_mem;
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size_t scratch_cap;
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size_t scratch_len;
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/* Random number generator */
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JanetRNG rng;
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/* Traversal pointers */
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JanetTraversalNode *traversal;
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JanetTraversalNode *traversal_top;
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JanetTraversalNode *traversal_base;
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/* Threading */
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#ifdef JANET_THREADS
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JanetMailbox *mailbox;
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JanetThread *thread_current;
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JanetTable *thread_decode;
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#endif
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/* Event loop and scheduler globals */
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#ifdef JANET_EV
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size_t tq_count;
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size_t tq_capacity;
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JanetQueue spawn;
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JanetTimeout *tq;
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JanetRNG ev_rng;
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JanetListenerState **listeners;
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size_t listener_count;
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size_t listener_cap;
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size_t extra_listeners;
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#ifdef JANET_WINDOWS
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void **iocp;
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#elif defined(JANET_EV_EPOLL)
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JanetHandle selfpipe[2];
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int epoll;
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int timerfd;
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int timer_enabled;
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#else
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JanetHandle selfpipe[2];
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struct pollfd *fds;
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#endif
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#endif
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};
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extern JANET_THREAD_LOCAL JanetVM janet_vm;
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/* Setup / teardown */
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#ifdef JANET_THREADS
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void janet_threads_init(void);
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void janet_threads_deinit(void);
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#endif
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#ifdef JANET_NET
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void janet_net_init(void);
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void janet_net_deinit(void);
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#endif
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#ifdef JANET_EV
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void janet_ev_init(void);
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void janet_ev_deinit(void);
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#endif
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#endif /* JANET_STATE_H_defined */
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