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58 lines
1.8 KiB
58 lines
1.8 KiB
4 years ago
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#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 "local_runqueue.h"
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#include "panic.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 in the following scenarios:
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* - A sandbox in the SANDBOX_INITIALIZED state completes initialization and is ready to be run
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* - A sandbox in the SANDBOX_BLOCKED state completes what was blocking it and is ready to be run
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*
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* @param sandbox
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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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/* Preemption occurs indirectly via the SANDBOX_RUNNING_KERNEL state, so preemptable is set
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* to false during the process of preemption.
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*/
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assert(sandbox->ctxt.preemptable == false);
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uint64_t now = __getcycles();
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uint64_t duration_of_last_state = now - sandbox->timestamp_of.last_state_change;
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sandbox->state = SANDBOX_SET_AS_PREEMPTED;
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sandbox_state_history_append(sandbox, SANDBOX_SET_AS_PREEMPTED);
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switch (last_state) {
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case SANDBOX_RUNNING_KERNEL: {
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sandbox->duration_of_state.preempted += duration_of_last_state;
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current_sandbox_set(NULL);
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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->timestamp_of.last_state_change = now;
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sandbox->state = SANDBOX_PREEMPTED;
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/* State Change Bookkeeping */
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sandbox_state_history_append(sandbox, SANDBOX_PREEMPTED);
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runtime_sandbox_total_increment(SANDBOX_PREEMPTED);
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runtime_sandbox_total_decrement(last_state);
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}
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