Enrico Fraccaroli (Galfurian)
44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
/// @file sched.h
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/// @brief Structures and functions for managing the scheduler.
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/// @copyright (c) 2014-2024 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include "sys/types.h"
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#include "time.h"
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#include "stdbool.h"
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/// @brief Structure that describes scheduling parameters.
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typedef struct sched_param_t {
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/// Static execution priority.
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int sched_priority;
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/// Expected period of the task
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time_t period;
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/// Absolute deadline
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time_t deadline;
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/// Absolute time of arrival of the task
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time_t arrivaltime;
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/// Is task periodic?
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bool_t is_periodic;
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} sched_param_t;
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/// @brief Sets scheduling parameters.
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/// @param pid pid of the process we want to change the parameters. If zero,
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/// then the parameters of the calling process are set.
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/// @param param The interpretation of the argument param depends on the
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/// scheduling policy of the thread identified by pid.
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/// @return 0 on success, -1 on failure and errno is set to indicate the error.
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int sched_setparam(pid_t pid, const sched_param_t *param);
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/// @brief Gets scheduling parameters.
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/// @param pid pid of the process we want to retrieve the parameters. If zero,
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/// then the parameters of the calling process are returned.
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/// @param param The interpretation of the argument param depends on the
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/// scheduling policy of the thread identified by pid.
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/// @return 0 on success, -1 on failure and errno is set to indicate the error.
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int sched_getparam(pid_t pid, sched_param_t *param);
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/// @brief Placed at the end of an infinite while loop, stops the process until,
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/// its next period starts. The calling process must be a periodic one.
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/// @return 0 on success, -1 on failure and errno is set to indicate the error.
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int waitperiod(void);
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