c8d0edc06a
- Remove sanity checks for initialized mutexes and condition variables. This significantly boosts performance. The checks can be turned back on by compiling libmthread with MTHREAD_STRICT. According to POSIX operations on uninitialized variables are a MAY fail if, therefore allowing this optimization. - Test59 has to be accommodated to the lack of sanity checks on uninitialized variables in the library. It specifically tests for them and will run into segfaults when the checks are absent in the library. - Fix a few bugs related to the scheduler - Do some general code cleanups
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* EXTERN should be extern, except for the allocate file */
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#ifdef ALLOCATE
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#undef EXTERN
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#define EXTERN
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#endif
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#include <assert.h>
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#define NO_THREADS 4
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#define MAX_THREAD_POOL 1024
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#define STACKSZ 4096
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#define MAIN_THREAD -1
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#define NO_THREAD -2
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#define isokthreadid(i) (i == MAIN_THREAD || (i >= 0 && i < no_threads))
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#define MTHREAD_INIT_MAGIC 0xca11ab1e
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#define MTHREAD_NOT_INUSE 0xdefec7
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typedef enum {
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MS_CONDITION, MS_DEAD, MS_EXITING, MS_FALLBACK_EXITING, MS_MUTEX, MS_RUNNABLE
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} mthread_state_t;
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struct __mthread_tcb {
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mthread_thread_t m_tid; /* My own ID */
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mthread_state_t m_state; /* Thread state */
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struct __mthread_attr m_attr; /* Thread attributes */
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struct __mthread_cond *m_cond; /* Condition variable that this thread
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* might be blocking on */
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void *(*m_proc)(void *); /* Procedure to run */
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void *m_arg; /* Argument passed to procedure */
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void *m_result; /* Result after procedure returns */
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mthread_cond_t m_exited; /* Condition variable signaling this
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* thread has ended */
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mthread_mutex_t m_exitm; /* Mutex to accompany exit condition */
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ucontext_t m_context; /* Thread machine context */
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struct __mthread_tcb *m_next; /* Next thread in linked list */
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};
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typedef struct __mthread_tcb mthread_tcb_t;
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EXTERN mthread_thread_t current_thread;
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EXTERN mthread_queue_t free_threads;
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EXTERN mthread_queue_t run_queue; /* FIFO of runnable threads */
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EXTERN mthread_tcb_t **threads;
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EXTERN mthread_tcb_t fallback;
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EXTERN mthread_tcb_t mainthread;
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EXTERN int no_threads;
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EXTERN int used_threads;
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EXTERN int running_main_thread;
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EXTERN char fallback_stack[STACKSZ];
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