mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Yukihiro "Matz" Matsumoto
96e91004cd
reduced TASK_STACK_INIT_SIZE from 64 to 16 and TASK_CI_INIT_SIZE from 8 to 4, matching mruby-fiber's conservative allocations. this saves 56 bytes per task (320 bytes down to 160 bytes for initial allocations). stacks grow dynamically via mrb_stack_extend when needed. Co-authored-by: Claude <noreply@anthropic.com>
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
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** task.h - Task scheduler
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**
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** See Copyright Notice in mruby.h
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*/
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#ifndef MRUBY_TASK_H
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#define MRUBY_TASK_H
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#include <mruby.h>
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/*
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* Task status values (bit-mapped)
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*/
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enum {
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MRB_TASK_STATUS_DORMANT = 0x00, /* Not started or finished */
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MRB_TASK_STATUS_READY = 0x02, /* Ready to run */
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MRB_TASK_STATUS_RUNNING = 0x03, /* Currently executing */
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MRB_TASK_STATUS_WAITING = 0x04, /* Waiting for condition */
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MRB_TASK_STATUS_SUSPENDED = 0x08, /* Manually suspended */
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};
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/*
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* Task wait reason
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*/
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enum {
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MRB_TASK_REASON_NONE = 0x00, /* No specific reason */
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MRB_TASK_REASON_SLEEP = 0x01, /* Sleeping for time */
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MRB_TASK_REASON_MUTEX = 0x02, /* Waiting for mutex (reserved) */
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MRB_TASK_REASON_JOIN = 0x04, /* Waiting for another task */
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};
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/*
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* Task structure - represents a single task in the scheduler
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*
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* Memory-optimized layout:
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* - Removed priority_preemption (always equals priority): 1 byte
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* - Removed started flag (inferred from c.status): 1 byte
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* - Unified wakeup_tick/join/mutex into single union: 4 bytes
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* - Removed redundant proc field (stored in c.ci->proc): 8 bytes
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* - Unified timeslice/result into state union: ~4 bytes
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* Total savings: ~18 bytes per task (14% reduction)
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*/
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typedef struct mrb_task {
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struct mrb_task *next; /* Linked list pointer */
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uint8_t priority; /* Priority (0-255, 0=highest) */
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uint8_t status; /* Current status (TASKSTATUS enum) */
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uint8_t reason; /* Wait reason (TASKREASON enum) */
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mrb_value name; /* Optional task name */
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/* Wait-specific data - mutually exclusive based on reason field */
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union {
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uint32_t wakeup_tick; /* Tick count to wake up (REASON_SLEEP) */
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const struct mrb_task *join; /* Task being waited on (REASON_JOIN) */
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void *mutex; /* Mutex pointer (REASON_MUTEX, reserved) */
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} wait;
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mrb_value self; /* Ruby Task object reference */
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/* State-specific data - mutually exclusive based on status */
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union {
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volatile uint8_t timeslice; /* Remaining ticks (RUNNING only) */
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mrb_value result; /* Task return value (DORMANT only) */
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} state;
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struct mrb_context c; /* Execution context (stack, callinfo, etc) */
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} mrb_task;
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/*
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* Task queue configuration
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* (mrb_task_state is defined in mruby.h)
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*/
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#define MRB_NUM_TASK_QUEUE 4
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/* Queue indices */
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#define MRB_TASK_QUEUE_DORMANT 0
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#define MRB_TASK_QUEUE_READY 1
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#define MRB_TASK_QUEUE_WAITING 2
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#define MRB_TASK_QUEUE_SUSPENDED 3
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/* Configuration */
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#ifndef MRB_TICK_UNIT
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#define MRB_TICK_UNIT 4 /* Tick period in milliseconds */
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#endif
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#ifndef MRB_TIMESLICE_TICK_COUNT
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#define MRB_TIMESLICE_TICK_COUNT 3 /* Number of ticks per timeslice */
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#endif
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#define TASK_STACK_INIT_SIZE 16 /* Initial task stack size */
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#define TASK_CI_INIT_SIZE 4 /* Initial task callinfo size */
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/*
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* HAL (Hardware Abstraction Layer) functions
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* Platform-specific implementations must provide these
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*/
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void mrb_task_hal_init(mrb_state *mrb);
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void mrb_task_hal_final(mrb_state *mrb);
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void mrb_task_enable_irq(void);
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void mrb_task_disable_irq(void);
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void mrb_task_hal_idle_cpu(mrb_state *mrb);
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/*
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* Core task scheduler API
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*/
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void mrb_tick(mrb_state *mrb);
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mrb_value mrb_task_run(mrb_state *mrb);
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void mrb_task_mark_all(mrb_state *mrb);
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#endif /* MRUBY_TASK_H */
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