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>Synchronization Levels</TITLE
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TITLE="Device Driver Interface to the Kernel"
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TITLE="Device Driver Models"
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>eCos Reference Manual</TH
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>Prev</A
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>Chapter 18. Device Driver Interface to the Kernel</TD
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><H1
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NAME="DEVAPI-SYNCHRONIZATION-LEVELS">Synchronization Levels</H1
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><P
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>Since it would be dangerous for an ISR or DSR to make a call
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that might reschedule the current thread (by trying to lock a mutex
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for example) all functions in this API have an associated synchronization
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level. These levels are:</P
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><DT
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>Thread</DT
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>      This function may only be called from within threads. This is
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      usually the client code that makes calls into the device driver.
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      In a non-kernel configuration, this will be code running at the
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      default non-interrupt level.
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      </P
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><DT
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>DSR</DT
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>      This function may be called by either DSR or thread code.
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      </P
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>ISR</DT
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><P
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>      This function may be called from ISR, DSR or thread code.
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      </P
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>The following table shows, for each API function, the levels
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at which is may be called:</P
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>                                  Callable from:
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Function                       ISR     DSR    Thread
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-------------------------------------------------------------------------
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cyg_drv_isr_lock                X       X       X
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cyg_drv_isr_unlock              X       X       X
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cyg_drv_spinlock_init                           X
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cyg_drv_spinlock_destroy                        X
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cyg_drv_spinlock_spin           X       X       X
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cyg_drv_spinlock_clear          X       X       X
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cyg_drv_spinlock_try            X       X       X
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cyg_drv_spinlock_test           X       X       X
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cyg_drv_spinlock_spin_intsave   X       X       X
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cyg_drv_spinlock_clear_intsave  X       X       X
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cyg_drv_dsr_lock                        X       X
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cyg_drv_dsr_unlock                      X       X
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cyg_drv_mutex_init                              X
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cyg_drv_mutex_destroy                           X
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cyg_drv_mutex_lock                              X
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cyg_drv_mutex_trylock                           X
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cyg_drv_mutex_unlock                            X
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cyg_drv_mutex_release                           X
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cyg_drv_cond_init                               X
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cyg_drv_cond_destroy                            X
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cyg_drv_cond_wait                               X
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cyg_drv_cond_signal                     X       X
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cyg_drv_cond_broadcast                  X       X
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cyg_drv_interrupt_create                        X
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cyg_drv_interrupt_delete                        X
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cyg_drv_interrupt_attach        X       X       X
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cyg_drv_interrupt_detach        X       X       X
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cyg_drv_interrupt_mask          X       X       X
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cyg_drv_interrupt_unmask        X       X       X
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cyg_drv_interrupt_acknowledge   X       X       X
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cyg_drv_interrupt_configure     X       X       X
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cyg_drv_interrupt_level         X       X       X
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cyg_drv_interrupt_set_cpu       X       X       X
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cyg_drv_interrupt_get_cpu       X       X       X&#13;</PRE
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