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51 lines
1.5 KiB
51 lines
1.5 KiB
#pragma once
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#include <assert.h>
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#include <stdint.h>
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#include "arch/getcycles.h"
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#include "panic.h"
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#include "sandbox_state.h"
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#include "sandbox_types.h"
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/**
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* Transitions a sandbox to the SANDBOX_PREEMPTED state.
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*
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* This occurs when a sandbox is executing and in a RUNNING state and a SIGALRM software interrupt fires
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* and pulls a sandbox with an earlier absolute deadline from the global request scheduler.
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*
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* @param sandbox the sandbox being preempted
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* @param last_state the state the sandbox is transitioning from. This is expressed as a constant to
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* enable the compiler to perform constant propagation optimizations.
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*/
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static inline void
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sandbox_set_as_preempted(struct sandbox *sandbox, sandbox_state_t last_state)
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{
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assert(sandbox);
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assert(!software_interrupt_is_enabled());
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uint64_t now = __getcycles();
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uint64_t duration_of_last_state = now - sandbox->last_state_change_timestamp;
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sandbox->state = SANDBOX_SET_AS_PREEMPTED;
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switch (last_state) {
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case SANDBOX_RUNNING: {
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sandbox->running_duration += duration_of_last_state;
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break;
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}
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default: {
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panic("Sandbox %lu | Illegal transition from %s to Preempted\n", sandbox->id,
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sandbox_state_stringify(last_state));
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}
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}
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sandbox->last_state_change_timestamp = now;
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sandbox->state = SANDBOX_PREEMPTED;
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/* State Change Bookkeeping */
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sandbox_state_log_transition(sandbox->id, last_state, SANDBOX_PREEMPTED);
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runtime_sandbox_total_increment(SANDBOX_PREEMPTED);
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runtime_sandbox_total_decrement(SANDBOX_RUNNING);
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}
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