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143 lines
5.3 KiB
ReStructuredText
143 lines
5.3 KiB
ReStructuredText
.. meta::
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:description: rocSHMEM intra-kernel networking runtime for AMD dGPUs on the ROCm platform.
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:keywords: rocSHMEM, API, ROCm, documentation, HIP, Networking, Communication
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.. _rocshmem-api-pt2pt-sync:
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-----------------------------------------
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Point-to-point synchronization routines
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-----------------------------------------
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ROCSHMEM_WAIT_UNTIL
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-------------------
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.. cpp:function:: __device__ void rocshmem_TYPENAME_wait_until(TYPE *ivars, int cmp, TYPE val)
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:param ivars: Pointer to memory on the symmetric heap to wait for.
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:param cmp: Operation for the comparison.
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:param val: Value to compare the memory at ``ivars`` to.
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:returns: None.
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**Description:**
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This routine blocks the caller until the condition ``(*ivars cmp val)`` is true.
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Valid ``cmp`` values are listed in :ref:`CMP_VALUES`.
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Valid ``TYPENAME`` and ``TYPE`` values are listed in :ref:`STANDARD_AMO_TYPES`.
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ROCSHMEM_WAIT_UNTIL_ALL
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-----------------------
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.. cpp:function:: __device__ void rocshmem_TYPENAME_wait_until_all(TYPE *ivars, size_t nelems, const int* status, int cmp, TYPE val)
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:param ivars: Pointer to memory on the symmetric heap to wait for.
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:param nelems: Number of elements in the ``ivars`` array.
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:param status: Array of length ``nelems`` to exclude elements from the wait.
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:param cmp: Operation for the comparison.
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:param val: Value to compare.
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:returns: None.
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**Description:**
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This routine blocks the caller until the condition ``(ivars[i] cmp val)`` is true for all ``ivars``.
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Valid ``cmp`` values are listed in :ref:`CMP_VALUES`.
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Valid ``TYPENAME`` and ``TYPE`` values are listed in :ref:`STANDARD_AMO_TYPES`.
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ROCSHMEM_WAIT_UNTIL_ANY
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-----------------------
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.. cpp:function:: __device__ size_t rocshmem_TYPENAME_wait_until_any(TYPE *ivars, size_t nelems, const int* status, int cmp, TYPE val)
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:param ivars: Pointer to memory on the symmetric heap to wait for.
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:param nelems: Number of elements in the ``ivars`` array.
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:param status: Array of length ``nelems`` to exclude elements from the wait.
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:param cmp: Operation for the comparison.
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:param val: Value to compare.
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:returns: The index of an element in the ``ivars`` array that satisfies the wait condition. If the wait set is empty, this routine returns ``SIZE_MAX``.
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**Description:**
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This routine blocks the caller until any of the condition ``(ivars[i] cmp val)`` is true.
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Valid ``cmp`` values are listed in :ref:`CMP_VALUES`.
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Valid ``TYPENAME`` and ``TYPE`` values are listed in :ref:`STANDARD_AMO_TYPES`.
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ROCSHMEM_WAIT_UNTIL_SOME
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------------------------
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.. cpp:function:: __device__ size_t rocshmem_TYPENAME_wait_until_some(TYPE *ivars, size_t nelems, size_t* indices, const int* status, int cmp, TYPE val)
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:param ivars: Pointer to memory on the symmetric heap to wait for.
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:param nelems: Number of elements in the ``ivars`` array.
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:param indices: List of indices with a length of at least ``nelems``.
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:param status: Array of length ``nelems`` to exclude elements from the wait.
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:param cmp: Operation for the comparison.
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:param val: Value to compare.
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:returns: The number of indices returned in the indices array. If the wait set is empty, this routine returns ``0``.
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**Description:**
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This routine blocks the caller until any of the conditions ``(ivars[i] cmp val)`` is true.
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Valid ``cmp`` values are listed in :ref:`CMP_VALUES`.
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Valid ``TYPENAME`` and ``TYPE`` values are listed in :ref:`STANDARD_AMO_TYPES`.
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ROCSHMEM_TEST
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-------------
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.. cpp:function:: __device__ int rocshmem_TYPENAME_test(TYPE *ivars, int cmp, TYPE val)
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:param ivars: Pointer to memory on the symmetric heap to wait for.
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:param cmp: Operation for the comparison.
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:param val: Value to compare the memory at ``ivars`` to.
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:returns: ``1`` if the evaluation is true. ``0`` otherwise.
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**Description:**
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This routine tests if the condition ``(*ivars cmp val)`` is true.
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ROCSHMEM_SIGNAL_WAIT_UNTIL_ON_STREAM
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-------------------------------------
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.. cpp:function:: __host__ void rocshmem_signal_wait_until_on_stream(uint64_t *sig_addr, int cmp, uint64_t cmp_value, hipStream_t stream)
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:param sig_addr: Address of the signal variable on the symmetric heap.
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:param cmp: Comparison operator (e.g., ROCSHMEM_CMP_EQ, ROCSHMEM_CMP_GE, etc.).
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:param cmp_value: Value to compare against.
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:param stream: HIP stream on which to enqueue the operation.
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:returns: None.
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**Description:**
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This routine enqueues a wait operation on a HIP stream. The function blocks the calling thread
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until the signal variable at ``sig_addr`` satisfies the comparison condition ``(*sig_addr cmp cmp_value)``.
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The wait operation is executed asynchronously on the specified stream. The caller must synchronize
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the stream (e.g., using ``hipStreamSynchronize``) to ensure the wait condition has been satisfied.
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Valid ``cmp`` values are listed in :ref:`CMP_VALUES`.
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.. _CMP_VALUES:
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Supported comparisons
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---------------------
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The following table lists the point-to-point comparison constants:
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.. list-table:: Point-to-Point Comparison Constants
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:widths: 20 20
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:header-rows: 1
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* - Constant
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- Description
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* - ROCSHMEM_CMP_EQ
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- Equal
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* - ROCSHMEM_CMP_NE
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- Not equal
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* - ROCSHMEM_CMP_GT
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- Greater than
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* - ROCSHMEM_CMP_GE
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- Greater than or equal to
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* - ROCSHMEM_CMP_LT
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- Less than
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* - ROCSHMEM_CMP_LE
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- Less than or equal to
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